Lub Dub Sounds Systole Diastole May 2026

Systole. The chamber contracts. Pressure peaks. Blood explodes into the aorta. The mitral valve whispers goodbye as it snaps shut. This is the sound of doing .

The marks Systole . This is the heart's power move. The bottom chambers—the ventricles—squeeze tight. The valves between the upper and lower chambers (the AV valves) slam shut. That slamming door? That’s your 'Lub.' lub dub sounds systole diastole

Diastole. The chamber expands. Pressure drops. Blood trickles in from the lungs. The aortic valve catches the wave, slamming the gate. This is the sound of receiving . Systole

"The human heart doesn't sing. It knocks. Two knocks per beat. Lub... Dub. lub dub sounds systole diastole

Tap the sound on to hear your own lub-dub. [Visual: Animation of a beating heart with valves opening/closing]