If Blood Pressure Is Reduced to near Zero by the Time

question 59

Multiple Choice

If blood pressure is reduced to near zero by the time the blood enters the venules and veins to return to the heart, how does it move?

• A) The veins pump it back to the heart.
• B) The pumping of the heart sucks the blood back into it.
• C) This is why organisms stretch frequently. They're forcing "used" blood back to the heart.
• D) The veins, the valves in them, and the skeletal muscles around them work together to keep the blood moving back to the heart.
• E) The valves in the veins keep the blood moving back to the heart.

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