Question

25 POINTS!!!!!!!

How do capillaries differ in structure from arteries and veins?

A. Capillaries have smoother muscle tissue than veins.
B. Capillaries appear to have a larger diameter than veins
C. Capillaries have valves which are absent in arteries.
D. Capillaries are only one cell thick and lack smooth muscle.

Answer 1

The correct answer is D I promise :))

Step-by-step explanation:

I took the test

Answer 2

Capillaries are only one cell thick and lack smooth muscle. Capillaries are tiny and do not have valves.