Which of the Following Types of Arteries Has a Poorly

Question

Which of the following types of arteries has a poorly defined tunica externa?
A) Venules
B) Muscular arteries
C) Arterioles
D) Elastic arteries
E) Connective arteries

Accepted Answer

Arterioles, which are small branches of arteries leading to capillaries, have a poorly defined tunica externa compared to larger arteries. This is because their primary function is to regulate blood flow into capillary beds, and they have a relatively thin wall structure to facilitate this function.