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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