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signals.","correct":false,"explanation":"Electrical impulses are released and transmitted by the nervous system, not endocrine glands. Endocrine glands release hormones, which act as chemical messengers."},{"text":"Digestive enzymes - biological catalysts.","correct":false,"explanation":"Digestive enzymes are produced by organs such as the pancreas and stomach to break down food. Endocrine glands release hormones as chemical messengers."},{"text":"Antibodies - defensive proteins.","correct":false,"explanation":"Antibodies are produced by lymphocytes as part of the immune response. Endocrine glands release hormones, which carry chemical signals around the body."}]},{"id":"c89f72bf-33f4-4a06-b513-968c949ccafd","cardType":"basic","points":1,"front":"Where are hormones secreted?","back":"Directly into the bloodstream.","mcqOptions":[{"text":"Directly into the bloodstream.","correct":true,"explanation":"Endocrine glands secrete hormones directly into the bloodstream, allowing them to travel to target organs elsewhere in the body."},{"text":"Directly into the digestive system.","correct":false,"explanation":"Hormones are not released into the digestive system. Endocrine glands secrete them directly into the bloodstream so they can reach target organs."},{"text":"Directly into the nervous system.","correct":false,"explanation":"Hormones do not enter the nervous system directly. They are secreted into the bloodstream, which transports them to their target organs."},{"text":"Directly onto the skin surface.","correct":false,"explanation":"Endocrine glands do not release hormones onto the skin. Hormones enter the bloodstream, where they are carried to specific target organs."}]},{"id":"d82afeee-f789-4cb6-97ea-2b9b72586b98","cardType":"basic","points":1,"front":"What happens when a hormone reaches its target organ?","back":"It produces an effect in the target organ.","mcqOptions":[{"text":"It produces an effect in the target organ.","correct":true,"explanation":"A hormone binds to receptors in its target organ and causes a specific effect there, such as changing the organ’s activity."},{"text":"It is destroyed before causing an effect in the target organ.","correct":false,"explanation":"A hormone reaching its target organ is not necessarily destroyed. It causes an effect by interacting with suitable receptors in that organ."},{"text":"It produces an impulse in the target organ.","correct":false,"explanation":"An impulse is associated mainly with nervous communication. A hormone produces an effect in its target organ through chemical signalling."},{"text":"It changes into a different hormone in the target organ.","correct":false,"explanation":"The target organ usually responds to the hormone rather than converting it into another hormone. The hormone produces a specific effect there."}]},{"id":"3323d968-5899-4687-bd87-77e077c5ecb9","cardType":"basic","points":2,"front":"Why can one endocrine gland affect organs throughout the body?","back":"Its hormones travel in the blood to target organs all over the body.","mcqOptions":[{"text":"Its hormones travel in the blood to target organs all over the body.","correct":true,"explanation":"Hormones enter the bloodstream and can be transported throughout the body. Only organs with the appropriate receptors respond as target organs."},{"text":"Its hormones travel through the nerves to every organ in the body.","correct":false,"explanation":"Nerves carry electrical impulses, not endocrine hormones. Hormones travel in the blood, allowing one gland to influence target organs throughout the body."},{"text":"Its hormones spread through the airways to every organ in the body.","correct":false,"explanation":"Hormones are not transported through the airways. They are released into the blood, which carries them to target organs around the body."},{"text":"Its hormones pass through the digestive tract to target organs all over the body.","correct":false,"explanation":"The digestive tract transports food and its products, not hormones from endocrine glands. Hormones reach distant target organs through the bloodstream."}]},{"id":"f8ab99e2-4abc-47b6-a11d-66b5a43dadf0","cardType":"basic","points":3,"front":"How do the nervous and endocrine systems differ?","back":"

Nervous system: electrical impulses act quickly but briefly.
Endocrine system: hormones travel slowly but act for longer.

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Nervous system: electrical impulses act quickly but briefly.
Endocrine system: hormones travel slowly but act for longer.

","correct":true,"explanation":"The nervous system uses rapid electrical impulses with short-lived effects, whereas the endocrine system uses hormones carried in blood, producing slower but longer-lasting effects."},{"text":"

Nervous system: hormones act slowly but briefly.
Endocrine system: electrical impulses travel quickly but act for longer.

","correct":false,"explanation":"This reverses the two systems’ signals. The nervous system uses fast electrical impulses with brief effects; the endocrine system uses slower hormones with longer effects."},{"text":"

Nervous system: electrical impulses act slowly but for longer.
Endocrine system: hormones travel quickly but briefly.

","correct":false,"explanation":"The speed and duration have been reversed. Nervous impulses act quickly and briefly, while hormones travel more slowly and generally have longer-lasting effects."},{"text":"

Nervous system: hormones act quickly but briefly.
Endocrine system: electrical impulses travel slowly but act for longer.

","correct":false,"explanation":"The signal types have been swapped between the systems. Nerves use electrical impulses, while endocrine glands release hormones carried in the blood."}]},{"id":"a1bd13f6-89ca-4873-bc3d-6a2f8c5cc494","cardType":"basic","points":1,"front":"What do the nervous and endocrine systems both do?","back":"They both coordinate the body.","mcqOptions":[{"text":"They both coordinate the body.","correct":true,"explanation":"Both systems coordinate body functions by communicating information and controlling responses, helping organs work together and maintain suitable conditions."},{"text":"They both digest food.","correct":false,"explanation":"Digestion is carried out by the digestive system, not primarily by the nervous and endocrine systems. Both communication systems coordinate body activities."},{"text":"They both carry oxygen.","correct":false,"explanation":"The circulatory system carries oxygen in the blood. The nervous and endocrine systems communicate with body tissues and coordinate their activities."},{"text":"They both destroy pathogens.","correct":false,"explanation":"Destroying pathogens is a function of the immune system. The nervous and endocrine systems coordinate body processes through electrical and chemical signalling."}]},{"id":"e596ea13-bfa7-4363-b33a-6f45d470bcea","cardType":"basic","points":1,"front":"Where is the pituitary gland located?","back":"In the brain.","mcqOptions":[{"text":"In the brain.","correct":true,"explanation":"The pituitary gland is a small endocrine gland located at the base of the brain, where it helps regulate other endocrine glands."},{"text":"In the neck.","correct":false,"explanation":"The thyroid gland is located in the neck. The pituitary gland is located in the brain, at its base."},{"text":"Below the stomach.","correct":false,"explanation":"The pancreas is located below the stomach. The pituitary gland is found in the brain and acts as an important endocrine control gland."},{"text":"In the lower abdomen.","correct":false,"explanation":"The ovaries are located in the lower abdomen. The pituitary gland is located in the brain, rather than in the reproductive organs."}]},{"id":"a16c7c47-52cb-4438-beb4-89dbc8de8849","cardType":"basic","points":2,"front":"Why is the pituitary gland called the master gland?","back":"It releases hormones that control other endocrine glands.","mcqOptions":[{"text":"It releases hormones that control other endocrine glands.","correct":true,"explanation":"The pituitary gland is called the master gland because its hormones stimulate and regulate the activity of other endocrine glands."},{"text":"It releases hormones that digest food in the stomach.","correct":false,"explanation":"Digestive processes are not the reason for the pituitary’s name. It is called the master gland because it controls other endocrine glands."},{"text":"It releases hormones that carry oxygen around the body.","correct":false,"explanation":"Red blood cells carry oxygen, not pituitary hormones. The pituitary is the master gland because its hormones regulate other endocrine glands."},{"text":"It releases hormones that destroy pathogens directly.","correct":false,"explanation":"Pathogen destruction is part of immune defence and is not the pituitary’s defining role. Its hormones control the activity of other endocrine glands."}]},{"id":"6bb4dcc2-0dec-4592-afaf-efb1a83b28f9","cardType":"basic","points":1,"front":"What determines when the pituitary gland secretes hormones?","back":"It responds to conditions in the body.","mcqOptions":[{"text":"It responds to conditions in the body.","correct":true,"explanation":"The pituitary gland detects or responds to changing conditions in the body and secretes hormones that help coordinate appropriate responses."},{"text":"It responds only to light levels in the environment.","correct":false,"explanation":"Light can influence some biological processes, but pituitary hormone secretion is not determined only by light levels. It responds to conditions in the body."},{"text":"It responds only to the amount of food eaten.","correct":false,"explanation":"Food intake can affect some hormones, but it is not the sole control. The pituitary responds more broadly to changing conditions within the body."},{"text":"It responds only to signals from the muscles.","correct":false,"explanation":"Muscle signals are not the only factor controlling pituitary secretion. The gland responds to conditions in the body and coordinates endocrine responses."}]},{"id":"e2b95574-c3cc-4000-aec3-545f1d8341b3","cardType":"basic","points":2,"front":"How can pituitary hormones affect other endocrine glands?","back":"They make other glands release their own hormones.","mcqOptions":[{"text":"They make other glands release their own hormones.","correct":true,"explanation":"Pituitary hormones act on other endocrine glands, stimulating them to secrete their own hormones and coordinate wider body responses."},{"text":"They make other glands absorb oxygen from the blood.","correct":false,"explanation":"Endocrine hormones do not make glands absorb oxygen. Pituitary hormones can stimulate other glands to release their own hormones."},{"text":"They make other glands digest proteins directly.","correct":false,"explanation":"Protein digestion is performed by digestive enzymes, not by pituitary control hormones. Pituitary hormones regulate other endocrine glands’ hormone release."},{"text":"They make other glands produce electrical impulses.","correct":false,"explanation":"Electrical impulses are signals used by the nervous system. Pituitary hormones influence other endocrine glands by causing them to release hormones."}]},{"id":"c2cdc7f7-e787-4b3f-aeb7-b82c2a80e1c5","cardType":"basic","points":1,"front":"Where is the thyroid gland?","back":"In the neck.","mcqOptions":[{"text":"In the neck.","correct":true,"explanation":"The thyroid gland is located in the neck. It releases hormones involved in regulating processes such as metabolic rate."},{"text":"In the brain.","correct":false,"explanation":"The pituitary gland is located in the brain. The thyroid gland is found in the neck, where it releases thyroid hormones."},{"text":"Below the stomach.","correct":false,"explanation":"The pancreas lies below the stomach. The thyroid gland is located in the neck and is a separate endocrine gland."},{"text":"In the lower abdomen.","correct":false,"explanation":"The ovaries are found in the lower abdomen. The thyroid gland is located in the neck, in front of the trachea."}]},{"id":"bff12063-80d2-43ea-af89-ba95eccd22d5","cardType":"basic","points":1,"front":"Where is the pancreas?","back":"Below the stomach.","mcqOptions":[{"text":"Below the stomach.","correct":true,"explanation":"The pancreas is located below the stomach. It has both endocrine functions, such as releasing insulin, and digestive functions."},{"text":"In the neck.","correct":false,"explanation":"The thyroid gland is located in the neck. The pancreas lies below the stomach and has both endocrine and digestive roles."},{"text":"In the brain.","correct":false,"explanation":"The pituitary gland is located in the brain. The pancreas is positioned below the stomach, near the first part of the small intestine."},{"text":"In the lower abdomen.","correct":false,"explanation":"The ovaries are located in the lower abdomen. The pancreas is located below the stomach, not among the reproductive organs."}]},{"id":"b9d181e5-1e42-4ced-8d65-4fe40b940c97","cardType":"basic","points":1,"front":"Where are the ovaries?","back":"In the lower abdomen in females.","mcqOptions":[{"text":"In the lower abdomen in females.","correct":true,"explanation":"The ovaries are female reproductive organs located in the lower abdomen. They also act as endocrine glands by releasing hormones such as oestrogen."},{"text":"In the lower abdomen in males.","correct":false,"explanation":"The testes are the male reproductive organs. The ovaries are located in the lower abdomen in females and release reproductive hormones."},{"text":"In the neck in females.","correct":false,"explanation":"The thyroid gland is located in the neck. Female ovaries are located in the lower abdomen and produce reproductive hormones."},{"text":"In the brain in females.","correct":false,"explanation":"The pituitary gland is located in the brain. The ovaries are female reproductive organs found in the lower abdomen."}]},{"id":"4e8900be-98a1-4e14-a0b1-2378cfd03f39","cardType":"basic","points":1,"front":"Where are the testes?","back":"In males.","mcqOptions":[{"text":"In males.","correct":true,"explanation":"The testes are male reproductive organs. They are also endocrine glands because they release hormones such as testosterone."},{"text":"In females.","correct":false,"explanation":"The ovaries are the female reproductive organs that release hormones such as oestrogen. The testes are found in males and produce testosterone."},{"text":"In all adults.","correct":false,"explanation":"The testes are male reproductive organs rather than organs present in all adults. Females have ovaries, which perform the corresponding reproductive endocrine role."},{"text":"In children only.","correct":false,"explanation":"The testes are present in males throughout life, although their activity changes during development. They are not organs found only in children."}]},{"id":"3ca33daf-5bb4-4770-83d5-7b68586ffa4a","cardType":"cloze","points":null,"front":"The endocrine system is made of [ ] that release hormones.","back":"The endocrine system is made of glands that release hormones.","mcqOptions":[{"text":"glands","correct":true,"explanation":"The endocrine system is made of glands that release hormones. These hormones act as chemical messengers and coordinate processes throughout the body."},{"text":"neurons","correct":false,"explanation":"Neurons are specialised cells that transmit nervous impulses. The blank requires glands, because endocrine glands release hormones into the bloodstream."},{"text":"enzymes","correct":false,"explanation":"Enzymes are biological catalysts that speed up chemical reactions. The endocrine system is made of glands, which secrete hormones."},{"text":"organs","correct":false,"explanation":"Some endocrine glands are organs, but organs is too general for the term required here. The endocrine system specifically consists of hormone-releasing glands."}]},{"id":"9d4d16ee-50ca-4ca0-b94e-d599c01c3640","cardType":"cloze","points":null,"front":"A hormone is a chemical messenger carried in the blood to a [ ].","back":"A hormone is a chemical messenger carried in the blood to a target organ.","mcqOptions":[{"text":"target organ","correct":true,"explanation":"A hormone is carried in the blood to its target organ, which contains receptors for that hormone and produces the appropriate response."},{"text":"receptor cell","correct":false,"explanation":"A receptor cell may detect a hormone, but the sentence asks where the hormone is carried. The correct term is target organ, the organ that responds."},{"text":"digestive organ","correct":false,"explanation":"Hormones are not carried specifically to digestive organs. They travel to a target organ, which is identified by having receptors for that hormone."},{"text":"control centre","correct":false,"explanation":"A control centre may regulate body processes, but it is not the general destination named in the definition. Hormones travel to a target organ."}]},{"id":"a3b46e00-fb1d-40ca-8b49-860403419ae5","cardType":"cloze","points":null,"front":"Nerve impulses are [ ].","back":"Nerve impulses are electrical.","mcqOptions":[{"text":"electrical","correct":true,"explanation":"Nerve impulses are electrical signals that travel rapidly along neurones, allowing the nervous system to produce fast and precisely targeted responses."},{"text":"chemical","correct":false,"explanation":"Chemical neurotransmitters carry signals across synapses, but impulses travelling along neurones are electrical. Therefore, the correct description of nerve impulses is electrical."},{"text":"mechanical","correct":false,"explanation":"Mechanical signals involve physical movement or pressure, not information travelling along neurones. Nerve impulses are electrical signals generated by changes across cell membranes."},{"text":"thermal","correct":false,"explanation":"Temperature changes can stimulate sensory receptors, but the resulting nerve impulses are not thermal. They are electrical signals travelling along neurones."}]},{"id":"c09c5e91-86ed-4ed9-b4ad-e9ec7f30e75d","cardType":"cloze","points":null,"front":"Hormones travel more slowly than nerve impulses, but their effects last [ ].","back":"Hormones travel more slowly than nerve impulses, but their effects last much longer.","mcqOptions":[{"text":"much longer","correct":true,"explanation":"Hormones are carried through the blood and may remain active for extended periods, so their effects generally last much longer than those of nerve impulses."},{"text":"only briefly","correct":false,"explanation":"This confuses hormonal responses with short-lived nervous responses. Hormones act more slowly, but their effects generally last much longer than the effects of nerve impulses."},{"text":"a much shorter time","correct":false,"explanation":"This reverses the comparison between the two communication systems. Hormonal effects usually last much longer, whereas nervous responses are generally rapid and short-lived."},{"text":"the same length of time","correct":false,"explanation":"The two systems differ in response duration as well as speed. Hormones travel more slowly, but their effects generally last much longer than nervous responses."}]},{"id":"f20ee82f-e31c-432e-8215-7ce0fd653fac","cardType":"cloze","points":null,"front":"The pituitary gland releases several hormones into the [ ].","back":"The pituitary gland releases several hormones into the blood.","mcqOptions":[{"text":"blood","correct":true,"explanation":"The pituitary is an endocrine gland, so it secretes hormones directly into the blood. The circulation then transports them to their target organs."},{"text":"lymph","correct":false,"explanation":"Confusing the lymphatic and circulatory systems makes this tempting. Pituitary hormones are released directly into the blood, which carries them to their target organs."},{"text":"ducts","correct":false,"explanation":"Ducts are used by exocrine glands, such as salivary glands. The pituitary is endocrine and therefore releases its hormones directly into the blood."},{"text":"spinal cord","correct":false,"explanation":"The spinal cord transmits nerve impulses rather than transporting hormones. Pituitary hormones enter the blood, which carries them around the body to target organs."}]},{"id":"847f1ac5-be61-4970-b1bb-f8caa9f550c5","cardType":"cloze","points":null,"front":"The adrenal glands are found one on top of each [ ].","back":"The adrenal glands are found one on top of each kidney.","mcqOptions":[{"text":"kidney","correct":true,"explanation":"There are two adrenal glands, with one positioned above each kidney. They release hormones including adrenaline in response to stressful or dangerous situations."},{"text":"lung","correct":false,"explanation":"The paired arrangement of the lungs may cause this confusion, but adrenal glands are not above them. One adrenal gland is positioned above each kidney."},{"text":"ovary","correct":false,"explanation":"The ovaries are reproductive endocrine organs, but adrenal glands are not attached to them. One adrenal gland is located on top of each kidney."},{"text":"testis","correct":false,"explanation":"The testes produce reproductive hormones, but they do not support the adrenal glands. One adrenal gland is found on top of each kidney."}]}]}],"examCountdown":{"examDate":"2027-05-11","paperLabel":"Paper 1"},"heading":"5.3.1 Human endocrine system","title":"5.3.1 Human endocrine system Flashcards","topbar":{"backHref":"/gcse/biology/aqa/flashcards"},"topicSidebar":"$L38"}]}],"topicId":"805819f7-f218-5bfa-9d54-acc51fceb1a1","walled":"$L39"}],"$L3a","$L3b"]