All about the heart and blood vessels!

The heart

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1. 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
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2. What do the cords in the heart do?

  • keep the atria in shape
  • keep the ventricles in shape
  • attach the atrioventricular valves to the ventricles to stop them being forced up into the atria when the ventricles contract
  • attach the semilunar valves to the ventricles to stop them being forced up into the aorta

3. How is blood helped to flow through veins?

  • by contraction of body muscles surrounding them
  • by the veins contracting
  • by the valves

4. Do veins contain valves?

  • Yes
  • No

5. If there is higher pressure behind a valve, is it forced open or shut?

  • open
  • shut

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