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The "Lub" sound occurs when the AV valves (tricuspid and bicuspid) close, while the "Dub" sound occurs when the semilunar valves close.
Ref: NCERT Class 11 Biology Chapter 15: Body Fluids and Circulation Human Heart - Structure and Cardiac Cycle
The first heart sound "Lub" is caused by the closure of the atrioventricular (AV) valves.
Ref: NCERT Class 11 Biology Chapter 15: Body Fluids and Circulation Human Heart - Structure and Cardiac Cycle
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