All the work of pumping blood in humans is done by the heart.

Name: All the work of pumping blood in humans is done by the heart.
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While the heart is the primary organ responsible for pumping blood throughout the body, the circulatory system also relies on the contraction of muscles and the presence of valves in veins to assist in moving blood back to the heart, especially from the lower extremities.

All the Work of Pumping Blood in Humans Is Done