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Home Q & A Board Biology-Related Homework Help General Biology
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tyressjones tyressjones
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What is the role of valves in the veins?
A) They keep blood from flowing backward when the veins are squeezed by skeletal muscles.
B) They push the blood upward toward the heart.
C) They slow blood flow in the veins so that the blood can move more slowly in the capillaries.
D) They block the flow of blood to the heart until it has time to contract again.
E) They push the blood back toward the capillaries so that all the oxygen can be removed.
Textbook 
Biology: Life on Earth

Biology: Life on Earth


Edition: 10th
Authors:
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skeledentskeledent
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tyressjones Author
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6 years ago
Face with Open Mouth How can I every repay you!
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