What is the difference between the tunica externa in an artery compared to that in a vein?
a. The tunica externa is thinner in arteries than in veins.
b. The tunica externa is thicker in arteries than in veins.
c. Arteries do not have a tunica externa.
d. Veins do not have a tunica externa.
Answer: a. The tunica externa is thinner in arteries than in veins.
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