Differentiate between the following pairs on the basis of what is given in brackets: Beginning of the ventricular systole and the end of ventricular systole. (type of heart sound)
Explanation
The first heart sound (S1) occurs when the atrioventricular valves close at the beginning of ventricular systole, while the second heart sound (S2) occurs when the semilunar valves close at the end of ventricular systole.
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