19. The Blood Vessels
General Blood Vessel Structure
Multiple Choice
Multiple ChoiceWhich of the following statements is true?
A
The tunica media in veins is thicker than tunica media in arteries.
B
The tunica intima contains the endothelium, which lines the lumen of all blood vessels.
C
The walls of all blood vessels always have 3 distinct layers/tunics.
D
The tunica externa is mostly composed of smooth muscle that can contract, causing vasoconstriction.
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