What are the three layers of veins and arteries in order?

The correct order of the three layers of veins and arteries is Tunica Intima, Tunica Media, and Tunica Adventitia.

The Tunica Intima is the innermost layer, consisting of a thin layer of endothelial cells that provide a smooth surface for blood flow and helps reduce friction. This layer plays a crucial role in maintaining vascular health and is important in regulating blood flow and preventing clots.

Following this, the Tunica Media is the middle layer, made up primarily of smooth muscle and elastic tissue. This layer is responsible for the regulation of blood pressure and blood flow by contracting or relaxing, which alters the diameter of the vessels.

The outermost layer is the Tunica Adventitia, which is composed of connective tissue that provides structural support and elasticity to the vessels. It also contains nerves and smaller blood vessels that supply the walls of larger vessels.

Understanding this order is crucial for anyone involved in healthcare and IV therapy, as it relates to the structure and function of the circulatory system. The incorrect options rearrange the order of these layers, which can lead to confusion regarding their specific roles and functions in vascular anatomy.