-In what imaging plane are Figure 20-4A and Figure 20-4B?
Definitions:
Venous Valves
Structures within veins that prevent the backward flow of blood, crucial for blood returning to the heart.
Tunica Media
The middle layer of the wall of a blood vessel consisting mainly of smooth muscle cells and elastic fibers, responsible for regulating the diameter of the vessel.
Lumen
The inside space of a tubular structure, such as a blood vessel or intestine.
Carotid Sinus
A dilated area at the base of the internal carotid artery that contains receptors to help regulate blood pressure.
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