Explain the role of the valves in assisting the veins to return blood back to the heart

asked May 19, 2020 108k views

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4 votes

The veins pumps blood to the heats which then distributes it throughout the body

Benny Hallett answered May 21, 2020

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5 votes

Venous blood travels under low pressure and generally against gravity, valves keep it from flowing backwards

Bianka answered May 25, 2020

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