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which of the following is true of the tunica media?

which of the following is true of the tunica media?
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Answer #1

Answer: It contains vascular smooth muscle.

Explanation:

  • The wall of a blood vessel contains three layers ( inner-side to outer side):
    • Tunica intima
    • Tunica media
    • Tunica externa
  • Tunica intima - this layer contains endothelial cells, basement membrane and subendothelial layer of connective tissue.
  • Tunica media - this layer contains smooth muscle cells, elastic and connective tissue. This layer is thicker in arteries and thinner in veins.
  • Tunica externa - this layer contains only connective tissue. It also contain elastic lamina. The elastic lamina helps the blood vessel to attach to the surrounding tissue. It provides structural integrity to veins.
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