Biology
The first heart sound (Lubb) is produced due to
- closure of tricuspid and bicuspid valves
- closure of aortic and pulmonary valves
- rushing of blood through valves producing turbulence
- entry of blood into auricles
Circulatory System
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Answer
closure of tricuspid and bicuspid valves
Reason — Tricuspid and bicuspid valves get closed sharply at the start of ventricular systole.
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