What is the function of veins? Why do veins have valves? [2 MARKS]

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What is the function of veins? Why do veins have valves? [2 MARKS]

Answer:
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Each point: 1 Mark
Veins are the vessels which carry carbon dioxide-rich blood from all the parts of the body back to the heart.
Veins have valves which stop the blood from flowing backward.This is because blood pressure inveinsis very low (compared to arteries).

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