Adult Echocardiography Practice Exam

What is the outer layer of tissue in arteries called?

1. Tunica intima

2. Tunica media

3. Tunica adventitia

4. Tunica cardia

The correct answer is: Tunica media

The outer layer of tissue in arteries is known as the tunica adventitia. This layer consists of connective tissue that provides structural support and strength to the artery, helping it withstand the pressure of blood flow from the heart. The tunica adventitia is composed primarily of collagen and elastic fibers, allowing for flexibility and resilience. In contrast, the tunica intima is the innermost layer that lines the lumen of the artery and is primarily made up of endothelial cells. The tunica media, which lies between the intima and adventitia, consists of smooth muscle cells and elastic fibers that play a key role in regulating blood vessel diameter and blood pressure. The tunica cardia is not a recognized layer in the context of arterial structure; it pertains to the heart's layers, such as the myocardium and pericardium. Understanding these layers is essential for comprehending how arteries function, their structural integrity, and their role in the circulatory system.