Discover the Layers of Blood Vessels
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Questions and Answers

Which layer of the vessel is composed of concentric layers of smooth muscle cells?

  • Capillaries
  • Tunica intima
  • Tunica media (correct)
  • Tunica externa

    • What is the main function of the endothelial cells in the vessel lining?

  • To resist leukocyte adhesion
  • To form a barrier that contains blood within the lumen of the vessel (correct)
  • To modulate the immune response
  • To secrete vasodilators and vasoconstrictors

    • Which layer of the vessel contains strong connective tissue?

  • Tunica externa (correct)
  • Tunica media
  • Tunica intima
  • Capillaries

    • Which type of vessel has uniquely thin walls composed of only endothelial cells and basement membrane?

    <p>Capillaries</p> Signup and view all the answers

    What substances do endothelial cells secrete that modulate the contraction of smooth muscle cells in the vessel?

    <p>Vasodilators and vasoconstrictors</p> Signup and view all the answers

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