Question

fill in the blank question the walls of arteries and veins have three layers called

Explanation:

The walls of arteries and veins are composed of three distinct layers known as tunics. These tunics are the tunica intima (innermost layer), tunica media (middle layer), and tunica externa (outermost layer). Each has specific functions and tissue - types contributing to the overall structure and function of blood vessels.

Answer:

tunics