Which of the Following is True of the Tunica Media

Question

Which of the following is true of the tunica media?
A) It is found only within veins.
B) It contains vascular smooth muscle.
C) It is the only blood vessel layer that is found in the capillaries.
D) It is the thinnest of the three blood vessel layers.

Accepted Answer

The tunica media is found in arteries, veins, and arterioles, and it contains vascular smooth muscle. The tunica intima, not the tunica media, is the only blood vessel layer found in capillaries. The tunica adventitia is the thickest of the three layers, while the tunica media is the middle layer.