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Health, 20.09.2019 20:10 marziel24

Why do veins also have valves?
a. to keep the blood from circulating too fast
b. to regulate contractions of the heart
c. to keep the veins from losing blood
d. to prevent gravity from pulling the blood towards the feet

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Why do veins also have valves?
a. to keep the blood from circulating too fast
b. to re...

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