Other questions in this quiz

2. What is the function of valves?

  • Ensure the blood is flowing very fast
  • Ensure all oxygen diffuses from the blood
  • To prevent backflow
  • Prevent carbon dioxide diffusing into tissues

3. Why do capillaries in the brain have tight junctions?

  • Ensure that oxygen does not diffuse back into the capillaries
  • To prevent fluid on the brain
  • To prevent essential minerals diffusing into the capillaries
  • Prevent the drainage of brain fluid

4. What is the function of arterioles?

  • Constrict and dilate to control blood flow to individual organs
  • Remove tissue fluid
  • Link capillaries and veins
  • Prevent the diffusion of excess water

5. What is the blood pressure in the veins?

  • Medium
  • Very low
  • Very high
  • Greater than the arteries



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