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particularly calcium phosphate, form a hard inorganic matrix that gives mammalian bone its rigidity and resistance to compression."},{"text":"collagen fibres","correct":false,"explanation":"Collagen fibres provide tensile strength and flexibility rather than rigidity. Mineral salts, particularly calcium phosphate, harden the bone matrix and resist compression."},{"text":"elastic fibres","correct":false,"explanation":"Elastic fibres are associated with stretch and recoil in tissues, not bone hardness. Bone is made rigid by mineral salts deposited within its matrix."},{"text":"bone marrow","correct":false,"explanation":"Bone marrow produces blood cells and stores fat, but it does not harden bone. Rigidity results from mineral salts deposited in the extracellular matrix."}]},{"id":"0a522f26-ee5a-4622-8ad6-b8e60277ab06","cardType":"cloze","points":null,"front":"Mammalian bone is rigid due to mineral salts (e.g. calcium), while [ ] allow it to resist fracture.","back":"Mammalian bone is rigid due to mineral salts (e.g. calcium), while collagen fibres allow it to resist fracture.","mcqOptions":[{"text":"collagen fibres","correct":true,"explanation":"Collagen fibres give bone tensile strength and limited flexibility, allowing it to resist cracking and fracture when subjected to tension or bending."},{"text":"mineral salts","correct":false,"explanation":"Mineral salts make bone rigid and resistant to compression, but excessive rigidity alone would encourage fracture. Collagen fibres provide the tensile strength that resists breaking."},{"text":"elastic fibres","correct":false,"explanation":"Elastic fibres enable stretch and recoil in tissues such as arteries and lungs. In bone, collagen fibres provide the flexibility and tensile strength needed to resist fracture."},{"text":"muscle fibres","correct":false,"explanation":"Muscle fibres generate force by contracting and are not structural components of the bone matrix. Collagen fibres strengthen bone against tension and fracture."}]},{"id":"30ea9122-c4a3-4e94-a179-31608a6b4b99","cardType":"basic","points":3,"front":"What are the five main functions of the mammalian skeleton?","back":"

Support and shape
Protection of organs
Movement (acting as levers)
Blood cell production in marrow
Mineral storage (e.g. calcium)

","mcqOptions":[{"text":"

Support and shape
Protection of organs
Movement (acting as levers)
Blood cell production in marrow
Mineral storage (e.g. calcium)

","correct":true,"explanation":"The skeleton supports and shapes the body, protects organs, provides levers for movement, produces blood cells in bone marrow and stores minerals such as calcium."},{"text":"

Support and shape
Protection of organs
Movement (acting as levers)
Synovial fluid production in marrow
Mineral storage (e.g. calcium)

","correct":false,"explanation":"Synovial fluid is secreted by synovial membranes, not bone marrow. The marrow instead produces blood cells, alongside the skeleton’s support, protection, movement and mineral-storage functions."},{"text":"

Support and shape
Protection of organs
Movement (acting as levers)
Blood cell production in marrow
Glucose storage (e.g. glycogen)

","correct":false,"explanation":"The skeleton is an important store of minerals such as calcium, not glycogen. Its other main functions are support, protection, movement and blood cell production."},{"text":"

Support and shape
Protection of organs
Movement (acting as muscles)
Blood cell production in marrow
Mineral storage (e.g. calcium)

","correct":false,"explanation":"Bones do not act as muscles or generate contractions; they act as levers moved by muscles. The remaining functions are support, protection, blood cell production and mineral storage."}]},{"id":"f28f53b7-b578-487b-9b4b-8a1f96389212","cardType":"basic","points":1,"front":"Why must skeletal muscles be arranged in antagonistic pairs to move a joint in both directions?","back":"Muscles can only contract and pull; they cannot actively push.","mcqOptions":[{"text":"Muscles can only contract and pull; they cannot actively push.","correct":true,"explanation":"Muscle contraction generates pulling force through tendons. One muscle therefore pulls a joint one way, while its antagonist contracts to pull it in the opposite direction."},{"text":"Muscles can only relax and push; they cannot actively pull.","correct":false,"explanation":"Muscles do not create pushing force by relaxing. They contract to pull on bones, so an opposing muscle is required to pull the joint back."},{"text":"Muscles can only contract and push; they cannot actively pull.","correct":false,"explanation":"Contraction shortens a muscle and pulls on its tendon rather than pushing a bone. Antagonistic muscles are therefore needed to produce movement in opposite directions."},{"text":"Muscles can actively contract and relax; each can independently push.","correct":false,"explanation":"Relaxation does not generate an opposing force, and muscles cannot actively push. Each muscle contracts to pull, requiring an antagonist to reverse the joint’s movement."}]},{"id":"55432253-ce13-42c2-b4fe-fc577bc95894","cardType":"cloze","points":null,"front":"A synovial joint is a freely movable joint where bone ends are separated by a [ ] and enclosed by a joint capsule.","back":"A synovial joint is a freely movable joint where bone ends are separated by a fluid-filled cavity and enclosed by a joint capsule.","mcqOptions":[{"text":"fluid-filled cavity","correct":true,"explanation":"A synovial joint contains a cavity filled with synovial fluid, separating the articulating bone ends and allowing low-friction, freely movable articulation."},{"text":"cartilage-filled cavity","correct":false,"explanation":"Articular cartilage covers the bone ends but does not fill the space between them. A synovial joint has a fluid-filled cavity containing lubricating synovial fluid."},{"text":"marrow-filled cavity","correct":false,"explanation":"Marrow occupies internal spaces within bones rather than the gap between articulating surfaces. The bone ends at a synovial joint are separated by a fluid-filled cavity."},{"text":"air-filled cavity","correct":false,"explanation":"Air is not normally present between the bone ends of a synovial joint. The cavity contains synovial fluid, which lubricates the articulating surfaces."}]},{"id":"aa63eba8-6502-45cf-b281-b40193071750","cardType":"cloze","points":null,"front":"A synovial joint is a freely movable joint where bone ends are separated by a fluid-filled cavity and enclosed by a [ ].","back":"A synovial joint is a freely movable joint where bone ends are separated by a fluid-filled cavity and enclosed by a joint capsule.","mcqOptions":[{"text":"joint capsule","correct":true,"explanation":"The joint capsule surrounds the synovial joint, holds its components together and encloses the cavity while permitting movement between the articulating bones."},{"text":"tendon sheath","correct":false,"explanation":"A tendon sheath surrounds and reduces friction around a tendon rather than enclosing an entire joint. A synovial joint is enclosed by a joint capsule."},{"text":"cartilage plate","correct":false,"explanation":"Articular cartilage covers the ends of bones but does not enclose the joint. The fluid-filled synovial cavity is surrounded by a joint capsule."},{"text":"bursa sac","correct":false,"explanation":"A bursa is a separate fluid-filled sac that reduces friction near some joints. The structure enclosing the synovial joint itself is the joint capsule."}]},{"id":"ac603339-b8ec-419e-9674-a8c15a247395","cardType":"basic","points":2,"front":"What are the two primary functions of articular cartilage?","back":"

Reduces friction between bone ends
Acts as a shock absorber

","mcqOptions":[{"text":"

Reduces friction between bone ends
Acts as a shock absorber

","correct":true,"explanation":"Articular cartilage provides a smooth surface that reduces friction during movement and cushions compressive forces, helping to prevent damage to the ends of bones."},{"text":"

Increases friction between bone ends
Acts as a shock absorber

","correct":false,"explanation":"Articular cartilage provides a smooth surface, so it reduces rather than increases friction. It also deforms under compression and acts as a shock absorber."},{"text":"

Reduces friction between bone ends
Produces red blood cells

","correct":false,"explanation":"Red blood cells are produced in bone marrow, not articular cartilage. Cartilage instead reduces friction and absorbs shocks between the articulating bone ends."},{"text":"

Stores calcium between bone ends
Acts as a muscle attachment

","correct":false,"explanation":"Mineral storage occurs mainly in bone, while muscles attach through tendons. Articular cartilage instead reduces friction between bone ends and absorbs compressive shocks."}]},{"id":"343febb7-4656-4bd3-852e-762d4f43a0d2","cardType":"cloze","points":null,"front":"The synovial membrane secretes [ ], which functions to lubricate the joint.","back":"The synovial membrane secretes synovial fluid, which functions to lubricate the joint.","mcqOptions":[{"text":"synovial fluid","correct":true,"explanation":"The synovial membrane secretes synovial fluid into the joint cavity, where it lubricates the articulating surfaces and helps nourish the articular cartilage."},{"text":"lymphatic fluid","correct":false,"explanation":"Lymphatic fluid circulates through lymph vessels and supports fluid balance and immunity. Synovial membranes instead secrete synovial fluid to lubricate joints."},{"text":"interstitial fluid","correct":false,"explanation":"Interstitial fluid surrounds cells within tissues but is not the specialised joint lubricant. The synovial membrane secretes synovial fluid into the joint cavity."},{"text":"cerebrospinal fluid","correct":false,"explanation":"Cerebrospinal fluid cushions the brain and spinal cord, not articulating bones. Joints are lubricated by synovial fluid secreted by the synovial membrane."}]},{"id":"ac576301-a79f-47be-80e0-52f365244238","cardType":"cloze","points":null,"front":"The synovial membrane secretes synovial fluid, which functions to [ ] the joint.","back":"The synovial membrane secretes synovial fluid, which functions to lubricate the joint.","mcqOptions":[{"text":"lubricate","correct":true,"explanation":"Synovial fluid lubricates the articulating surfaces, reducing friction between them so the bones can move smoothly without damaging the articular cartilage."},{"text":"stabilise","correct":false,"explanation":"Joint stability is mainly provided by ligaments and surrounding muscles, not synovial fluid. The fluid’s role is to lubricate the joint and reduce friction during movement."},{"text":"immobilise","correct":false,"explanation":"Synovial fluid facilitates movement rather than preventing it. It lubricates the joint, allowing the articulating bone surfaces to move smoothly with less friction."},{"text":"strengthen","correct":false,"explanation":"Synovial fluid does not strengthen the joint structurally. It lubricates the articulating surfaces, while ligaments and muscles contribute to the joint’s strength and stability."}]},{"id":"8abd29d1-0056-4583-a558-671c7c2a4daa","cardType":"basic","points":2,"front":"What is the structural role of a ligament?","back":"It joins bone to bone to stabilise the joint and prevent dislocation.","mcqOptions":[{"text":"It joins bone to bone to stabilise the joint and prevent dislocation.","correct":true,"explanation":"Ligaments are strong bands of connective tissue joining one bone to another. They limit excessive movement, stabilising the joint and reducing the risk of dislocation."},{"text":"It joins muscle to bone to transmit the pulling force of contraction.","correct":false,"explanation":"Joining muscle to bone and transmitting muscular force is the role of a tendon. A ligament joins bone to bone, stabilising the joint and preventing dislocation."},{"text":"It joins bone to bone to produce movement at the joint.","correct":false,"explanation":"Ligaments do join bone to bone, but they do not actively produce movement. They stabilise joints and limit excessive movement, while contracting muscles generate movement."},{"text":"It covers the ends of bones to reduce friction during movement.","correct":false,"explanation":"Covering bone ends and reducing friction is the role of articular cartilage. A ligament instead joins bone to bone to stabilise the joint and prevent dislocation."}]},{"id":"5611d634-ca5c-4bf7-a8a2-090540979a40","cardType":"basic","points":2,"front":"What is the structural role of a tendon?","back":"It joins muscle to bone to transmit the pulling force of contraction.","mcqOptions":[{"text":"It joins muscle to bone to transmit the pulling force of contraction.","correct":true,"explanation":"A tendon connects a muscle to a bone. When the muscle contracts, the tendon transmits its pulling force to the bone, producing movement at the joint."},{"text":"It joins bone to bone to stabilise the joint and prevent dislocation.","correct":false,"explanation":"Joining bone to bone and stabilising a joint is the role of a ligament. A tendon joins muscle to bone and transmits the pulling force of contraction."},{"text":"It covers the ends of bones to reduce friction during movement.","correct":false,"explanation":"Articular cartilage covers the ends of bones and reduces friction. A tendon instead connects muscle to bone, transmitting muscular force so that the bone moves."},{"text":"It surrounds the joint cavity to secrete synovial fluid during movement.","correct":false,"explanation":"The synovial membrane surrounds the joint cavity and secretes synovial fluid. A tendon connects muscle to bone and transmits the pulling force generated during contraction."}]},{"id":"6dde6cda-bb07-4840-bdb8-2f4661f77c53","cardType":"basic","points":2,"front":"Explain why damage to articular cartilage in the knee causes painful movement.","back":"

Increased friction as bone surfaces rub together
Reduced shock absorption leading to impact damage

","mcqOptions":[{"text":"

Increased friction as bone surfaces rub together
Reduced shock absorption leading to impact damage

","correct":true,"explanation":"Articular cartilage provides a smooth, shock-absorbing surface. Its damage exposes rougher bone surfaces, increasing friction and reducing cushioning, so movement and impacts become painful."},{"text":"

Decreased friction as bone surfaces rub together
Greater shock absorption preventing impact damage

","correct":false,"explanation":"This reverses both effects of cartilage damage. Exposed bone surfaces experience increased friction, while the loss of cartilage reduces shock absorption and allows painful impact damage."},{"text":"

Reduced joint stability as bones are no longer held together
Reduced force transmission from muscle to bone

","correct":false,"explanation":"These are primarily the consequences of ligament and tendon damage. Damaged articular cartilage causes pain by increasing friction and reducing shock absorption between the bone surfaces."},{"text":"

Increased synovial fluid causing the joint to lock
Reduced muscle contraction preventing movement

","correct":false,"explanation":"Cartilage damage does not directly cause excess fluid or stop muscle contraction. It exposes less protected surfaces, increasing friction and reducing shock absorption during movement."}]},{"id":"f487ce6f-5698-4379-911a-57bbdbb54a00","cardType":"cloze","points":null,"front":"In muscle attachment, the [ ] is the fixed point, while the insertion is the point that moves.","back":"In muscle attachment, the origin is the fixed point, while the insertion is the point that moves.","mcqOptions":[{"text":"origin","correct":true,"explanation":"The origin is the muscle attachment that remains relatively fixed during contraction. The insertion is attached to the bone that moves towards the origin."},{"text":"insertion","correct":false,"explanation":"This reverses the two attachment terms. The insertion is the point that moves during contraction, whereas the origin is the relatively fixed attachment point."},{"text":"agonist","correct":false,"explanation":"An agonist is the muscle producing a particular movement, not an attachment point. The relatively fixed attachment of a muscle is called its origin."},{"text":"tendon","correct":false,"explanation":"A tendon is connective tissue attaching a muscle to a bone, rather than the name of the fixed attachment point. That point is the origin."}]},{"id":"b6a3f4cb-c146-435e-8288-2f9b3e05b12d","cardType":"cloze","points":null,"front":"In muscle attachment, the origin is the fixed point, while the [ ] is the point that moves.","back":"In muscle attachment, the origin is the fixed point, while the insertion is the point that moves.","mcqOptions":[{"text":"insertion","correct":true,"explanation":"The insertion is the muscle attachment on the bone that moves during contraction. It is pulled towards the relatively fixed attachment, known as the origin."},{"text":"origin","correct":false,"explanation":"This confuses the two attachment points. The origin remains relatively fixed during contraction, while the insertion is the attachment point that moves towards it."},{"text":"agonist","correct":false,"explanation":"An agonist is a muscle responsible for producing a movement, not the moving attachment point. The attachment that moves during contraction is the insertion."},{"text":"tendon","correct":false,"explanation":"A tendon connects muscle to bone but is not the term for the moving attachment point. The moving attachment is called the insertion."}]},{"id":"6801359a-973a-4db6-96da-e61b8610a3fb","cardType":"basic","points":2,"front":"What is the difference between flexion and extension?","back":"

Flexion: Bending a joint to decrease the angle.
Extension: Straightening a joint to increase the angle.

","mcqOptions":[{"text":"

Flexion: Bending a joint to decrease the angle.
Extension: Straightening a joint to increase the angle.

","correct":true,"explanation":"Flexion bends a joint and reduces the angle between the bones. Extension is the opposite movement, straightening the joint and increasing that angle."},{"text":"

Flexion: Straightening a joint to increase the angle.
Extension: Bending a joint to decrease the angle.

","correct":false,"explanation":"This swaps the definitions of the two movements. Flexion bends a joint and decreases its angle, whereas extension straightens it and increases the angle."},{"text":"

Flexion: Bending a joint to decrease the angle.
Extension: Straightening a joint to decrease the angle.

","correct":false,"explanation":"The flexion definition is accurate, but extension increases rather than decreases the joint angle. Extension straightens the joint, opposing the bending action of flexion."},{"text":"

Flexion: Bending a joint to increase the angle.
Extension: Straightening a joint to increase the angle.

","correct":false,"explanation":"The extension definition is accurate, but flexion decreases rather than increases the joint angle. Bending brings the connected bones closer together and reduces the angle."}]},{"id":"9203b8d6-4236-4ef9-9111-8ec9ecbce90c","cardType":"basic","points":2,"front":"During elbow flexion, state the state of the biceps and triceps.","back":"

Biceps: Contracts (shortens)
Triceps: Relaxes

","mcqOptions":[{"text":"

Biceps: Contracts (shortens)
Triceps: Relaxes

","correct":true,"explanation":"During elbow flexion, the biceps acts as the agonist and contracts, pulling the forearm upwards. The antagonistic triceps relaxes to allow this movement."},{"text":"

Biceps: Relaxes
Triceps: Contracts (shortens)

","correct":false,"explanation":"These muscle states produce elbow extension, not flexion. During flexion, the biceps contracts and shortens, while the opposing triceps relaxes."},{"text":"

Biceps: Contracts (shortens)
Triceps: Contracts (shortens)

","correct":false,"explanation":"This incorrectly suggests both antagonistic muscles contract fully together. During elbow flexion, the biceps contracts as the agonist while the triceps relaxes as the antagonist."},{"text":"

Biceps: Relaxes
Triceps: Relaxes

","correct":false,"explanation":"If both muscles relaxed, neither would generate the force needed for flexion. The biceps must contract and shorten, while the triceps relaxes to permit movement."}]},{"id":"477497d8-591d-43ef-a3e4-f7772c25f637","cardType":"basic","points":2,"front":"During elbow extension, state the state of the biceps and triceps.","back":"

Triceps: Contracts (shortens)
Biceps: Relaxes

","mcqOptions":[{"text":"

Triceps: Contracts (shortens)
Biceps: Relaxes

","correct":true,"explanation":"During elbow extension, the triceps contracts and pulls the forearm straight, while the antagonistic biceps relaxes to allow this movement."},{"text":"

Biceps: Contracts (shortens)
Triceps: Relaxes

","correct":false,"explanation":"This reverses the muscle roles and describes elbow flexion. Extension requires the triceps to contract and the biceps to relax because the triceps straightens the elbow."},{"text":"

Triceps: Relaxes
Biceps: Relaxes

","correct":false,"explanation":"Both muscles cannot relax to produce controlled elbow extension. The triceps must contract to straighten the joint, while the biceps relaxes as its antagonist."},{"text":"

Triceps: Contracts (shortens)
Biceps: Contracts (shortens)

","correct":false,"explanation":"Although co-contraction can stabilise a joint, it is not the usual antagonistic pattern for extension. The triceps contracts while the biceps relaxes to permit movement."}]},{"id":"547522c1-7152-485e-bdb4-1a0e24cd26bc","cardType":"cloze","points":null,"front":"During elbow flexion, the biceps tendon pulls on the [ ]; during extension, the triceps tendon pulls on the ulna.","back":"During elbow flexion, the biceps tendon pulls on the radius; during extension, the triceps tendon pulls on the ulna.","mcqOptions":[{"text":"radius","correct":true,"explanation":"The biceps tendon inserts on the radius, so biceps contraction pulls the radius upwards during elbow flexion. The triceps tendon acts on the ulna during extension."},{"text":"ulna","correct":false,"explanation":"The ulna is the bone acted on by the triceps tendon during extension, which makes it a tempting reversal. The biceps tendon pulls on the radius during flexion."},{"text":"humerus","correct":false,"explanation":"The humerus forms the upper arm and the elbow joint, but the biceps tendon pulls the forearm bone called the radius during flexion."},{"text":"scapula","correct":false,"explanation":"The scapula provides an attachment site for some shoulder muscles, but it is not the forearm bone moved by the biceps tendon. The correct bone is the radius."}]},{"id":"71d472ca-c1a5-48c5-928b-452cc2978ce9","cardType":"cloze","points":null,"front":"During elbow flexion, the biceps tendon pulls on the radius; during extension, the triceps tendon pulls on the [ ].","back":"During elbow flexion, the biceps tendon pulls on the radius; during extension, the triceps tendon pulls on the ulna.","mcqOptions":[{"text":"ulna","correct":true,"explanation":"The triceps tendon inserts on the ulna, so triceps contraction pulls the ulna and extends the elbow. The biceps tendon acts on the radius during flexion."},{"text":"radius","correct":false,"explanation":"The radius is the forearm bone pulled by the biceps tendon during flexion, so this option swaps the two muscle attachments. During extension, the triceps pulls on the ulna."},{"text":"humerus","correct":false,"explanation":"The humerus is the upper-arm bone involved in the elbow joint, but the triceps tendon pulls on the ulna to extend the forearm."},{"text":"scapula","correct":false,"explanation":"The scapula is part of the shoulder girdle rather than the forearm. Triceps contraction extends the elbow by pulling on the ulna."}]},{"id":"6edcc13b-6815-4580-b046-b37446a30c5a","cardType":"basic","points":2,"front":"In the musculoskeletal lever system, identify the four components.","back":"

Lever: Bone
Pivot (Fulcrum): Joint
Effort: Muscle contraction
Load: Weight of object/limb

","mcqOptions":[{"text":"

Lever: Bone
Pivot (Fulcrum): Joint
Effort: Muscle contraction
Load: Weight of object/limb

","correct":true,"explanation":"In the musculoskeletal lever system, the bone acts as the lever, the joint as the pivot, muscle contraction supplies the effort, and the object or limb provides the load."},{"text":"

Lever: Muscle
Pivot (Fulcrum): Bone
Effort: Joint movement
Load: Muscle contraction

","correct":false,"explanation":"This assigns structures and forces to the wrong roles. The bone is the lever, the joint is the pivot, muscle contraction is the effort, and the object or limb is the load."},{"text":"

Lever: Joint
Pivot (Fulcrum): Muscle
Effort: Weight of object/limb
Load: Bone

","correct":false,"explanation":"The joint cannot be the lever because it is the rotation point, while the bone moves around it. Muscle contraction supplies effort and the object's weight acts as the load."},{"text":"

Lever: Weight of object/limb
Pivot (Fulcrum): Joint
Effort: Bone
Load: Muscle contraction

","correct":false,"explanation":"This confuses the mechanical force with the structure producing movement. The bone is the lever, muscle contraction is the effort, and the object's weight is the load."}]},{"id":"35a50aef-4c59-4eae-bae4-b47b40dfd623","cardType":"cloze","points":null,"front":"The moment of a force is calculated using the formula: $\\text{[...]}$ where $d$ is the perpendicular distance from the pivot.","back":"The moment of a force is calculated using the formula: $\\boxed{\\text{moment} = F \\times d}$ where $d$ is the perpendicular distance from the pivot.","mcqOptions":[{"text":"$$\\text{moment} = F \\times d$","correct":true,"explanation":"The moment of a force equals the force multiplied by the perpendicular distance from the pivot: $\\text{moment} = F \\times d$. This measures the turning effect of the force."},{"text":"$$\\text{moment} = F + d$","correct":false,"explanation":"Adding force and distance is a common operation error, but a moment depends on their product. The correct relationship is $\\text{moment} = F \\times d$."},{"text":"$$\\text{moment} = \\frac{F}{d}$","correct":false,"explanation":"Dividing by distance gives the wrong dependence: increasing the distance should increase the turning effect. The correct formula multiplies force by perpendicular distance, $\\text{moment} = F \\times d$."},{"text":"$$\\text{moment} = \\frac{d}{F}$","correct":false,"explanation":"This reverses the variables and makes the moment decrease as force increases, contrary to the physics. The correct formula is $\\text{moment} = F \\times d$."}]},{"id":"ea0a4312-8689-4d2c-a1be-ec8d7c384114","cardType":"cloze","points":null,"front":"The moment of a force is calculated using the formula: $\\text{moment} = F \\times d$ where $d$ is the [ ] from the pivot.","back":"The moment of a force is calculated using the formula: $\\text{moment} = F \\times d$ where $d$ is the perpendicular distance from the pivot.","mcqOptions":[{"text":"perpendicular distance","correct":true,"explanation":"The distance used in the moment equation is the perpendicular distance from the pivot to the force's line of action. This gives the correct turning effect of the force."},{"text":"parallel distance","correct":false,"explanation":"A parallel distance does not provide the lever arm for rotation. Moments use the perpendicular distance from the pivot to the force's line of action."},{"text":"total distance","correct":false,"explanation":"The total length to the point where the force acts is not always the effective lever arm. The moment requires the perpendicular distance from the pivot."},{"text":"vertical distance","correct":false,"explanation":"Vertical distance is only relevant in particular arrangements and is not the general definition. The correct distance is perpendicular to the force's line of action."}]},{"id":"856e8617-160d-4220-a911-e01413211fd9","cardType":"basic","points":1,"front":"Why must the biceps often produce a force much larger than the load being lifted?","back":"The muscle is attached much closer to the pivot (joint) than the load is.","mcqOptions":[{"text":"The muscle is attached much closer to the pivot (joint) than the load is.","correct":true,"explanation":"The biceps has a short moment arm, so it must exert a larger force to produce a moment equal to the load's moment, which acts farther from the joint."},{"text":"The muscle is attached much farther from the pivot (joint) than the load is.","correct":false,"explanation":"A muscle farther from the pivot would have a longer moment arm and need less force for the same moment. The biceps is attached closer to the joint than the load."},{"text":"The muscle is attached at the same distance from the pivot (joint) as the load is.","correct":false,"explanation":"Equal distances would mean equal moment arms, so the muscle force would match the load force. The biceps is attached closer to the pivot, requiring a larger force."},{"text":"The muscle is attached much closer to the load than the pivot (joint) is.","correct":false,"explanation":"This compares the wrong points and does not describe the lever arm. The biceps attaches close to the pivot, while the load acts farther from the joint."}]},{"id":"2bd9660e-5aa0-4487-a990-bf1b34da19be","cardType":"basic","points":1,"front":"What is the immediate source of energy required for muscle contraction during exercise?","back":"ATP","mcqOptions":[{"text":"ATP","correct":true,"explanation":"ATP provides the immediate energy for muscle contraction. Hydrolysis of ATP supplies energy for myosin head movement and the processes involved in the sliding filament mechanism."},{"text":"ADP","correct":false,"explanation":"ADP is produced when ATP is hydrolysed and contains less usable chemical energy. ATP is the immediate energy source that powers myosin head movement."},{"text":"glucose","correct":false,"explanation":"Glucose is a fuel used to generate ATP through respiration, but it does not directly power the contractile mechanism. ATP is the immediate energy source for contraction."},{"text":"phosphocreatine","correct":false,"explanation":"Phosphocreatine rapidly resynthesises ATP during intense exercise, but it is not the molecule directly used by myosin. ATP provides the immediate energy for contraction."}]},{"id":"d90bbd11-7634-49e8-a69b-066d2de534f5","cardType":"cloze","points":null,"front":"Increased muscle contraction frequency during exercise increases the demand for [ ] and glucose for respiration.","back":"Increased muscle contraction frequency during exercise increases the demand for oxygen and glucose for respiration.","mcqOptions":[{"text":"oxygen","correct":true,"explanation":"Oxygen is required for aerobic respiration, which releases the ATP needed for repeated muscle contraction. More frequent contractions therefore increase the muscles’ demand for oxygen."},{"text":"carbon dioxide","correct":false,"explanation":"Carbon dioxide is produced by aerobic respiration rather than required as a reactant. The correct answer is oxygen, whose supply must increase to support greater ATP production."},{"text":"lactate","correct":false,"explanation":"Lactate may accumulate when oxygen delivery cannot meet demand, but it is not required for respiration. The correct answer is oxygen, which supports aerobic ATP production."},{"text":"urea","correct":false,"explanation":"Urea is formed mainly in the liver from excess amino acids, not used in muscle respiration. The correct answer is oxygen, needed for aerobic ATP production."}]},{"id":"c81d20f2-0217-4bc5-be4b-de17e06ea861","cardType":"cloze","points":null,"front":"Increased muscle contraction frequency during exercise increases the demand for oxygen and [ ] for respiration.","back":"Increased muscle contraction frequency during exercise increases the demand for oxygen and glucose for respiration.","mcqOptions":[{"text":"glucose","correct":true,"explanation":"Glucose is a respiratory substrate that muscle cells break down to release energy for ATP production. More frequent contraction therefore increases the demand for glucose."},{"text":"glycogen","correct":false,"explanation":"Glycogen is the storage carbohydrate that must first be broken down into glucose. The correct answer is glucose, which enters respiration to support ATP production."},{"text":"carbon dioxide","correct":false,"explanation":"Carbon dioxide is a product of aerobic respiration, not the fuel consumed by it. The correct answer is glucose, which is broken down to release energy."},{"text":"lactate","correct":false,"explanation":"Lactate is formed during anaerobic respiration and is not the main respiratory substrate demanded by contracting muscles. The correct answer is glucose, which releases energy during respiration."}]},{"id":"fb28a623-cfce-40da-b10b-ddbc0ee264c5","cardType":"basic","points":2,"front":"State the waste products produced by muscles that increase during intense exercise.","back":"

Carbon dioxide
Heat

","mcqOptions":[{"text":"

Carbon dioxide
Heat

","correct":true,"explanation":"Increased respiration produces more carbon dioxide, while respiration and muscle contraction release additional heat. Both waste products therefore increase as exercise becomes more intense."},{"text":"

Oxygen
Carbon dioxide

","correct":false,"explanation":"Oxygen is consumed by aerobic respiration rather than produced as waste. The waste products that increase are carbon dioxide from respiration and heat from energy transfers."},{"text":"

Glucose
Heat

","correct":false,"explanation":"Glucose is a respiratory substrate consumed by muscle cells, not a waste product. The correct waste products are carbon dioxide and heat, both produced more rapidly during exercise."},{"text":"

ATP
Oxygen

","correct":false,"explanation":"ATP is an energy-transfer molecule and oxygen is a respiratory reactant, so neither is classified as muscle waste. The waste products that increase are carbon dioxide and heat."}]}]}],"examCountdown":{"examDate":"2027-06-07","paperLabel":"Paper 1"},"heading":"Muscles, skeleton and movement","title":"Muscles, skeleton and movement Flashcards","topbar":{"backHref":"/a-level/biology/edexcel/a/flashcards"},"topicSidebar":"$L38"}]}],"topicId":"7473e35b-37a6-5ea8-98f9-03886bc596bb","walled":"$L39"}],"$L3a","$L3b"]