Question

Which statement best explains this type of blood vessel and the function of these vessels’ valves?

These are arteries, which prevent the backflow of blood because the walls have little muscle to pump blood back to the heart.
These are veins, which prevent the backflow of blood because the walls have little muscle to pump blood back to the heart.
These are arteries, which prevent the backflow of blood because the walls have little muscle to pump blood into the capillaries.
These are veins, which prevent the backflow of blood because the walls have little muscle to pump blood into the capillaries.

Answer 1

B. These are arteries, which prevent the backflow of blood because the walls have little muscle to pump blood back to the heart.

Step-by-step explanation:

Answer 2

The best answer for the blood vessels' valves would be these are veins that would then help in preventing the back flow of blood because the walls have small muscle to pump the blood back to the heart.Hope this is the answer.