Cardiac Vascular Nursing Certification Practice Exam 2026 - Free Cardiac Vascular Nursing Practice Questions and Study Guide

The layer of the vascular anatomy that is made up of smooth muscle cells, collagen, and elastin is indeed the media. This middle layer, or tunica media, plays a critical role in regulating blood vessel diameter through the contraction and relaxation of smooth muscle cells. This ability to constrict or dilate is essential for maintaining blood pressure and controlling blood flow to various tissues throughout the body.

Collagen provides structural support and strength to the vessel wall, helping to withstand the pressure of blood flow, while elastin allows the vessels to be flexible and elastic, accommodating changes in blood volume and pressure. The properties and composition of the media are particularly important in larger arteries, which must handle greater fluctuations in blood pressure compared to smaller vessels.

The other layers of the vascular anatomy have distinct structures and functions. The intima is the innermost layer, primarily composed of endothelial cells that allow for smooth blood flow and serve as a barrier between blood and the vessel wall. The adventitia, or outer layer, is composed mostly of connective tissue that provides additional support and contains blood vessels, nerves, and lymphatics that supply the vascular wall. The pericardium, while related to the heart's protection and support, is not a layer of blood vessels.