Question

why is tunica externa thicker in veins​

Answer 1

Answer:

This can be felt as a "pulse." Because of this pressure the walls of arteries are much thicker than those of veins. In addition, the tunica media is much thicker in arteries than in veins. As a result, arteries seem to have a more uniform shape - they tend to be more circular in shape than veins.

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Answer 2

The tunica externa is often thicker in veins to prevent collapse of the blood vessel and provide protection from damage since veins may be superficially located.