'Dup' sound is produced during closure of
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The period between the end of one heartbeat to the end of next heartbeat is called cardiac cycle. Cardiac cycle is formed of three phases.
Atrial systole, ventricular systole and joint diastole. During ventricular systole closing of Auriculo ventricular (AV) valves at the start of ventricular systole produces first heart sound called 'lubb' or systolic sound.
During joint diastole rapid closure of semilunar valves at the beginning of ventricular diastole produces the second heart sound called 'dup'.
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