A. ‘Lubb’ sound at the end of systole
B. ‘Dup’ sound at the end of systole
C. ‘Lubb’ sound at the beginning of systole
D. ‘Dup’ sound at the beginning of systole
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C. The first heart sound is ‘lubb’ sound at the beginning of systole.
C.
The first heart sound is ‘lubb’ sound at the beginning of systole.
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