Question

Veins have valves to​

Answer 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.

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Answer 2

Answer:

veins contain valves that ensures blood flows in only one direction

Explanation:

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