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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?

  • Yes
  • No

9. Which has a larger lumen - arteries or veins?

  • veins
  • arteries

10. Do arteries have thick or thin muscle layer?

  • Thick
  • Thin

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?

  • No
  • Yes

17. If there is higher pressure in front of a valve, is it forced open or shut?

  • shut
  • open

18. Are veins elastic?

  • No
  • yes

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