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Question
Which blood vessel wall layer is correctly matched with the description about its tissue structure?
Options:
A .  Tunica externa (adventitia) - consists of smooth muscle tissue
B .  Tunica interna (intima) - consists of only a thin layer of connective tissue
C .  Tunica media - consists of simple squamous epithelium
D .  Tunica media - consists of smooth muscle and elastic connective tissue, the amounts and proportions of each depending on vessel type
Answer: Option D
:
D
The tunica media is the middle layer of an artery or vein. It lies between the tunica intima on the inside and the tunica externa on the outside.The tunica media, or middle coat, is made up principally of smooth (involuntary) muscle cells and elastic connective tissues arranged in roughly spiral layers.It has the autonomic control of which can alter the diameter of the vessel and affect the blood pressure.

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