Question

plain how human heart beats

Answer 1

These sounds will interfere to produce detectable beats. The human ear is capable of detecting beats with frequencies of 7 Hz and below. A piano tuner frequently utilizes the phenomenon of beats to tune a piano string. She will pluck the string and tap a tuning fork at the same time.

Answer 2

the human heart never beats it just the opening of closing of autrioventricular valves during systole and diastole of heart which causes "lub" and "dubb" sounds..