Science, asked by Marvmahi06, 2 months ago

Why do veins have valves?



a)to maintain volume of blood

b)to prevent escape of carbon-dioxide gas

c)to prevent mixing of pure and impure blood

d)All of these

Answers

Answered by pawansahu705240
1

Answer:

Unlike arteries, veins contain valves that ensure blood flows in only one direction. (Arteries don't require valves because pressure from the heart is so strong that blood is only able to flow in one direction.) Valves also help blood travel back to the heart against the force of gravity.

Answered by agamjot6823
0

Answer:

a) to maintain volume of blood

Similar questions