When You Are Upright, What Is the Primary Mechanism That

question 4

Multiple Choice

When you are upright, what is the primary mechanism that propels blood in your feet back to your inferior vena cava?

• A)recoil of elastic fibers in the walls of the leg veins
• B)contraction of the left ventricle of the heart
• C)contraction of smooth muscle in the walls of the leg veins
• D)contraction of skeletal muscles in your legs

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