Examlex
Which of the following is not one of the operations normally performed on a drill press?
Valves
Structures present in the heart and veins that maintain unidirectional flow of blood by opening and closing in response to pressure differences.
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.
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