What are the layers of an artery from inner to outer?

The correct answer identifies the layers of an artery in the proper sequence as intima, media, and adventitia. The innermost layer, the intima, consists of a thin layer of endothelial cells that provide a smooth lining to reduce friction as blood flows through the vessel. Surrounding the intima is the media, comprised primarily of smooth muscle cells and elastic fibers, which enables the artery to regulate its diameter and withstand the pressure of blood flow. The outermost layer is the adventitia, which is made up of connective tissue that provides structural support and protection to the artery.

Understanding this arrangement is crucial for grasping how arteries function as part of the cardiovascular system, including their role in blood flow and pressure regulation. Each layer has specific characteristics and functions contributing to the overall health and efficiency of the blood vessels.