The walls of an artery are:

The walls of an artery are composed of three layers:

1. Tunica intima: This is the innermost layer of the artery wall. It consists of a thin layer of endothelial cells, which provide a smooth lining to facilitate the flow of blood. The tunica intima also contains a layer of connective tissue that supports the endothelium.

2. Tunica media: This is the middle layer of the artery wall and is made up of smooth muscle cells and elastic fibers. The smooth muscle cells help regulate the diameter of the artery and control blood flow. The elastic fibers allow the artery to stretch and recoil, maintaining its shape and keeping blood pressure within a normal range.

3. Tunica adventitia (also known as tunica externa): This is the outermost layer of the artery wall and is primarily composed of connective tissue. It provides structural support to the artery and contains blood vessels that supply oxygen and nutrients to the other layers of the artery wall. The tunica adventitia also contains nerve fibers that help regulate the diameter of the artery and modulate blood flow.

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The walls of an artery can be described as having three distinct layers. The innermost layer, called the tunica intima, consists of a smooth lining of endothelial cells that allow blood to flow smoothly. It also contains a layer of connective tissue that supports the endothelium. The middle layer, known as the tunica media, is made up of smooth muscle cells and elastic fibers. These smooth muscle cells help control the diameter of the artery and regulate blood flow, while the elastic fibers enable the artery to stretch and recoil. The outermost layer, called the tunica adventitia or tunica externa, is primarily composed of connective tissue. Its main function is to provide structural support to the artery, and it contains blood vessels that supply oxygen and nutrients to the other layers. Additionally, nerve fibers found in the tunica adventitia help regulate the artery's diameter and modulate blood flow.