The first heart sound 'Lubb' occurs in which phase of the cardiac cycle?

Question

The first heart sound 'Lubb' occurs in which phase of the cardiac cycle? (A) Isometric relaxation (B) Atrial diastole (C) Ventricular systole (D) Ventricular diastole

Tardigrade Admin · Accepted Answer

The first heart sound 'Lubb' can be heard, during contraction of the ventricles (i.e. ventricular systole). This is associated with the closure of the tricuspid and bicuspid valves.

Q. The first heart sound 'Lubb' occurs in which phase of the cardiac cycle?

Isometric relaxation

Atrial diastole

Ventricular systole

Ventricular diastole

The first heart sound 'Lubb' can be heard, during contraction of the ventricles (i.e. ventricular systole). This is associated with the closure of the tricuspid and bicuspid valves.