Question

A blood vessel with a thick layer of smooth muscle and elastic fibers is
A. a vein.
B. an artery.
C. a capillary.
D. the vena cava.

Answer 1

I feel its D.the vene cava

Answer 2

It is so because vene cava has to receive impure blood from the entire body.Hence the pressure it has to bear is more.

Answer 3

Thank you. :)