Which Layer of a Blood Vessel Contains Concentric Sheets of Smooth

Question

Which layer of a blood vessel contains concentric sheets of smooth muscle tissue?
A) tunica intima
B) external elastic membrane
C) tunica media
D) internal elastic membrane
E) tunica externa

Accepted Answer

The tunica media is the middle layer of a blood vessel that contains concentric sheets of smooth muscle tissue. This layer is responsible for regulating the diameter of the blood vessel and therefore controlling blood flow. The other options do not contain smooth muscle tissue in concentric sheets.