Multiple Choice
Blood is propelled back to the heart by ________.
A) rhythmic contractions of muscles in the walls of veins and the action of one-way valves
B) skeletal muscle contractions around veins and the action of one-way valves
C) the negative pressure of the heart pulling blood into the empty chambers
D) the natural flow of blood into ever-larger blood vessels leading to the heart
Correct Answer:
Verified
Correct Answer:
Verified
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