The one-way flow of blood in veins is maintained by
The one-way flow of blood in veins is maintained by ______________. positive pressure from the chest cavity
blood pressure
muscles pressing against the veins
their thick walls
valves
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The one-way flow of blood in veins is maintained by
The one-way flow of blood in veins is maintained by ______________. positive pressure from the chest cavity
blood pressure
muscles pressing against the veins
their thick walls
valves
hello where is the answer
the answer is valves