Anatomy and Physiology II Practice Test

Which layer of tissue is the outermost in an artery?

1. Tunica Adventitia

2. Tunica Intima

3. Tunica Media

4. Endothelium

The correct answer is: Tunica Adventitia

The outermost layer of tissue in an artery is known as the Tunica Adventitia. This layer primarily consists of connective tissue, which provides the artery with structural support and elasticity. The composition of the Tunica Adventitia can vary depending on the size and type of the artery, but it typically contains collagen and elastic fibers. This layer serves several important functions, including the anchoring of the artery to surrounding tissues and protection against external mechanical forces. The presence of blood vessels is also common in this layer, particularly in larger arteries, allowing for nourishment and support to the artery itself. Understanding the roles of different layers of arterial structure is essential, as each contributes to the overall function of the blood vessels in the circulatory system. In contrast, the other layers mentioned do not serve as the outermost layer: the Tunica Intima is the innermost layer lining the lumen of the artery, while the Tunica Media is the layer comprised mainly of smooth muscle and elastic fibers that controls the diameter of the vessel. The Endothelium, on the other hand, is the thin layer of cells that line the blood vessels and forms part of the Tunica Intima. Each of these layers plays a vital role in the overall structure and function