36 Which of the following mechanisms are used to prevent backflow of venous blood?
I) changing the force of heart contraction
II) contraction of smooth and skeletal muscles
III) one-way valves in the vein
IV) change in pressure within the chest cavity during inhalation
(A)I, II, and III
(B)II, III, and IV
(C) I, III, and IV
(D) only I and IV

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