Question

Valves allow blood to flow in one direction only due to the presence of -------​

Answer 1

Explanation:

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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.

Answer 2

→ Valves in veins are bicuspid, meaning they have two flap-like structures that regulate blood flow.

→ These flaps are made of elastic tissue.

→ The valves' main job is to keep the blood moving in one direction – back up towards the heart.