Which of the Following Is Not a Mechanism That Facilitates

question 110

Multiple Choice

Which of the following is not a mechanism that facilitates return of venous blood to the heart?

• A) Gravity, when veins are above the heart
• B) Contraction of skeletal muscles
• C) Breathing
• D) Contraction of smooth muscle in most veins of the body
• E) Valves in veins

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