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6. Why do arteries have elastic tissue in the walls?
- to cope with the high pressure caused by the heartbeat
- to expand in case of clot
- in case of damage
7. Why is the endothelium in the artery folded?
- to allow the artery to expand, helping it to cope with high pressure
- to give it a large surface area
8. Do veins contain valves?
9. Which has a larger lumen - arteries or veins?
10. Do arteries have thick or thin muscle layer?
11. What does the vena cava do?
- pump deoxygenated blood to the lungs
- bring deoxygenated blood back from the body
- pump oxygenated blood to the body
- bring oxygenated blood back from the lungs
12. Why do the ventricles have thicker walls than the atria?
- because they have to push blood out of the heart, whereas the atria just need to push blood a short distance to the ventricles
- they contain more blood so need more support
13. Why are capillary walls (endothelium) only one cell thick?
- To speed up diffusion
- To make them smaller
14. How is blood helped to flow through veins?
- by the valves
- by contraction of body muscles surrounding them
- by the veins contracting
15. What does the pulmonary artery do?
- bring oxygenated blood back from the lungs
- Pump deoxygenated blood to the lungs
- pump oxygenated blood to the body
- bring deoxygenated blood back from the body
16. Do arteries contain valves?
17. If there is higher pressure in front of a valve, is it forced open or shut?
19. What does the pulmonary vein do?
- pump oxygenated blood to the body
- brings oxygenated blood back from the lungs
- bring deoxygenated blood back from the body
- Pump deoxygenated blood to the lungs