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An Intiative by Sri Chaitanya
a
only right atrium and right ventricle
b
only left atrium and left ventricle
c
Both the right and left atria into the right and left ventricles respectively.
d
Both the right and the left ventricles into the pulmonary artery and the aorta respectively.
answer is D.
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Detailed Solution
The openings of the right and the left ventricles into the pulmonary artery and the aorta respectively are provided with the semilunar valves. These valves prevent any backward flow.