Question

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.
A. If both asseration and reason are true and the reason is the correct explanation of the assertion.
B. If both assertion and reason are true but reason is not the correct explanation of the assertion.
C. If assertion is true reason is false.
D. If both assertion and reason are false.

Answer 1

Correct Answer - A
The opening between the right atrium and the right ventricl is guarded by a valve formed of three muscular flaps or casps, the tricuspid valve, whereas a bicuspid or mitral valve guards the opening between the left ventricle.
The openings of the right and the left ventricles into the pulmonary artery and the aorta respectively are provided with the semilunar valves.
The valves in the heart allows the flow of blood only in one direction, i.e., from the atria to the ventricles and from the ventricles to the pulmonary artery aorta. These valves prevent any backward flow.