EVERYDAY SCIENCE

Detailed explanation-1: -The first Korotkoff sounds occur when the systolic pressure, the highest pressure reached when the ventricles contract and eject blood, first exceeds the pressure in the cuff so that blood once again flows through the artery beneath the stethoscope.

Detailed explanation-2: -Phase 1: A sharp tapping. This is the first sound heard as the cuff pressure is released. This sound provides the systolic pressure reading.

Detailed explanation-3: -Heart Sounds The first heart sound (S1) represents closure of the atrioventricular (mitral and tricuspid) valves as the ventricular pressures exceed atrial pressures at the beginning of systole (point a). S1 is normally a single sound because mitral and tricuspid valve closure occurs almost simultaneously.

Detailed explanation-4: -The first heart sound coincides with contraction of the ventricles, thus identifying the onset of ventricular systole and the end of mechanical diastole.

Detailed explanation-5: -A systolic heart murmur is an irregular “whoosh” or “swish” when your heart muscle contracts (systole). Sometimes, this sound occurs for no known reason and causes no problems. Other times, heart murmurs point to other heart conditions.