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(B) The heart produces two main sounds during the cardiac cycle,commonly described as 'lub' and 'dub'.The first heart sound,known as '$S_1$' or 'lub',

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Closure of tricuspid and bicuspid valves

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(B) The heart produces two main sounds during the cardiac cycle,commonly described as 'lub' and 'dub'.The first heart sound,known as '$S_1$' or 'lub',is produced by the closure of the atrioventricular valves (tricuspid and bicuspid/mitral valves) at the beginning of ventricular systole.The second heart sound,known as '$S_2$' or 'dub',is produced by the closure of the semilunar valves at the end of ventricular systole.

The first heart sound is associated with which of the following?

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