What Is the Role of Valves in the Veins

question 18

Multiple Choice

What is the role of valves in the veins?

• A) They push the blood back toward the capillaries so that all the oxygen can be removed.
• 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 keep blood from flowing backward when the veins are squeezed by skeletal muscles.

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