<prompt> This sound is produced during the closure of the semilunar valves.lubbdupplubb dupplubb duppshhh  <response>: B: The second heart sound can be represented by dupp. It occurs at the beginning of ventricular diastole and results from the closure of the semilunar valves.A: The first heart sound can be represented by the syllable lubb. It occurs at the beginning of ventricular systole and results from closure of the AV valves. 