Assertion: The valves of the heart (i.e....

Assertion: The valves of the heart (i.e., semilunar and atrio-ventricular valves) prevent any backward flow.
Reason: The valves in the heart allows the flow of blood only in one direction, i.e. from the atria to the ventricles and from ventricles to the pulmonary artery or aorta.

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Assertion: The valves of the heart (i.e., semilunar and atrio-ventricular valves) prevent any backward flow. Reason: The valves in the heart allows the flow of blood only in one direction, i.e. from the atria to the ventricles and from ventricles to the pulmonary artery or aorta.

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Assertion: The valves of the heart (i.e., semilunar and atrio-ventricular valves) prevent any backward flow.
Reason: The valves in the heart allows the flow of blood only in one direction, i.e. from the atria to the ventricles and from ventricles to the pulmonary artery or aorta.