B.P.S.C. (B.A.O.) 2024
What prevents backflow of blood during heart contraction?
aThick walls of the atria
bThick muscular walls of the ventricles
cHeart valves✓ Correct
dNone of the above
Explanation
During heart contraction, the heart valves prevent the backflow of blood. The atria store blood and their walls are thin. The ventricles pump blood to different parts of the body. Since blood pressure is higher in the ventricles, their walls are thick.
general-science