why are valves needed in the heart and veins
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Answer:
Explanation:
Because Veins carry the blood back to the heart and Valves also help blood travel back to the heart against the force of gravity.
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Explanation:
The heart is important because it pumps blood around your body, delivering oxygen and nutrients to your cells and removing waste products. ... There are valves between the atria and ventricles that make sure blood flows in one direction through your heart.
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