2.1 Supplying the cell

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Question 4

The human circulatory system contains three main types of blood vessels: arteries, capillaries, and veins. Identify which blood vessel matches each description by placing a checkmark ( $✓\checkmark$ ) in the correct columns.

Description	Arteries	Capillaries	Veins
Carry blood under very high pressure
Have walls that are only one cell thick
Contain valves to prevent backflow

[3]

Varicose veins are a condition where the valves in the veins of the legs fail to work properly.

Describe the effect this failure has on the direction of blood flow.
Name one common symptom or visual sign of varicose veins.

[2]

During moderate exercise, the stroke volume of an athlete's left ventricle is $ml115\text{ ml}$ per beat. Calculate the total volume of blood in liters ( $L\text{L}$ ) pumped into the aorta during a $45-minute45\text{-minute}$ workout if the athlete maintains an average heart rate of $minute140\text{ beats per minute}$ .

[3]

Description	Arteries	Capillaries	Veins
Carry blood under very high pressure
Have walls that are only one cell thick
Contain valves to prevent backflow

Varicose veins are a condition where the valves in the veins of the legs fail to work properly.

Describe the effect this failure has on the direction of blood flow.
Name one common symptom or visual sign of varicose veins.

[2]

[3]

2.1 Supplying the cell

Question 4

Markscheme

2.1 Supplying the cell

Question 4

Markscheme

2.1 Supplying the cell

Question 4

2.1 Supplying the cell Questions

2.1 Supplying the cell

Question 4

2.1 Supplying the cell Questions