The outermost layer of a blood vessel, which is very thick and composed chiefly of collagen fibers with scattered bands of elastic fibers, is the ________.
A) media
B) intima
C) external elastic membrane
D) adventitia
E) internal elastic membrane

Question

Quizplus · Accepted Answer

The outermost layer of a blood vessel is known as the adventitia (or tunica externa). It is primarily composed of collagen fibers, which provide structural support and flexibility to the vessel, and it may also contain elastic fibers to allow for some stretch. The adventitia serves as a protective layer.

The Outermost Layer of a Blood Vessel, Which Is Very