Veins primarily depend upon which of the following forces to return blood to the heart?
A)force of blood entering from the arteries
B)skeletal muscle contraction
C)valves to prevent blood back flow
D)All of the choices apply.

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The Answer of Veins primarily depend upon which of the following forces to return blood to the heart?
A)force of blood entering from the arteries
B)skeletal muscle contraction
C)valves to prevent blood back flow
D)All of the choices apply.

Veins Primarily Depend Upon Which of the Following Forces to Return