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Blood is propelled back to the heart by... a) relaxation of muscles in the walls of veins and the action of one-way valves b) contractions of the walls of capillaries c) the natural flow of blood into ever larger blood vessels leading to the heart d) skeletal muscle contractions around veins and the action of one-way valves e) the negative pressure of the heart pulling blood into the empty chambers
Sagot :
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