Is the ventricle contracting or relaxing during the first he

Is the ventricle contracting or relaxing during the first heart sound? Explain.

Solution

Ventricle is contracting.

When blood flows to the ventricles it also receives electrical stimulus from purkinnee fibres to cause it\'s contraction. This induces ventricular systole.This initital systole, tends topush blood to exit through open valves(Bicuspid and tricuspid valves). Rush of blood twoards the fills blood in parachute canopies of the valve leaflets casuing closure of the valves. This CLosure of tricuspid and bicuspid valve is almost synchronous and produces first sound of heart called \"LUB\".