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6. Which is not a way in which blood flow is maintained in the veins?
- One way valves to prevent backflow
- Breathing movements of the chest act as a pump forcing blood towards the heart
- Elastic recoil
- Muscles contract squeezing the veins forcing blood towards the heart
7. What is the blood pressure in the veins?
- Very low
- Greater than the arteries
- Very high
- Medium
8. What is the function of arterioles?
- Prevent the diffusion of excess water
- Remove tissue fluid
- Constrict and dilate to control blood flow to individual organs
- Link capillaries and veins
9. What is a property of blood entering the capillaries from the placenta and lungs?
- Blood is flowing very fast
- Blood is oxygenated
- Blood is deoxygenated
- Blood contains lots of glucose
10. What do artery walls contain?
- Collagen and elastic fibres only
- Elastic fibres, smooth muscle and collagen
- Elastic fibres and smooth muscle only
- Elastic fibres and collagen only
11. What is the diameter of a capillary?
- 7.5-8 um
- 9-10 um
- 0.5 um
- 4.5-6 um
12. Which is NOT an adaption of the capillaries?
- Bigger cross sectional area than the artery supplying them
- Large surface area for diffusion
- Rough lining
- Walls which are 1 cell thick