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Virty [35]
3 years ago
14

Why do veins also have valves?

Health
1 answer:
snow_lady [41]3 years ago
4 0

Answer:

the last choice.

Explanation:

veins have valves because venous pressure is often not great enough( as the blood must overcome gravity and other forces) to return the blood to the heart.

valves mainly prevent the back flow of blood.

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