Other questions in this quiz

2. The innermost layer of a blood vessel is called the...

  • tunica externa
  • endothelium
  • tunica media
  • lumen

3. How thick is the endothelium lining?

  • 2 cells thick
  • One cell thick
  • Half a cell thick
  • Four cells thick

4. What is the purpose of smooth muscle in blood vessels?

  • Smooth muscle regulates blood flow and maintains blood pressure
  • Increases blood flow

5. Why is the endothelium lining smooth?

  • Just cause
  • So that the blood is kept at a low pressure
  • To reduce friction and minimize the resistance of blood flow
  • To increase the rate of blood flow


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