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Which Mechanism Is Not One of the Mechanisms That Facilitates

Question 17

Multiple Choice

Which mechanism is not one of the mechanisms that facilitates the 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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