How do veins prevent backflow of the low-pressure blood they carry?
A) The muscular contractions of the skeletal muscles in which the veins are found provide movement.
B) Valves located in the veins prevent backflow.
C) Capillaries allow blood to move in both directions so that backflow can be controlled.
D) Both A and B
E) All of the above are correct.
Correct Answer:
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