Practice Quiz

COMLEX Osteopathic Medicine

Category - Respir./Circul

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Which valves are responsible for the active process of pushing venous blood from the legs back to the heart, but not allowing it to go in the opposite direction?
  1. Mitral valve
  2. Pulmonary valve
  3. Venous valve
  4. None of the above
Explanation
Answer - C - The venous valve is responsible for allowing venous blood to be pumped to the heart from the legs. This valve opens upon skeletal muscle contraction, but closes when these muscles are relaxed to ensure that the force of gravity does not allow de-oxygenated blood to flow backwards.
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