Lub Dub Sounds Systole Diastole _top_ May 2026

🔊 This is the loudest sound. It happens when the ventricles contract (Systole). The mitral and tricuspid valves snap shut, pushing blood up and out to your lungs and body. Think of it as the "Push."

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

"The human heart doesn't sing. It knocks. Two knocks per beat. Lub... Dub. 🔊 This is the loudest sound

The marks Diastole . The ventricles relax. But wait—the blood tries to flow backward. Luckily, the pulmonary and aortic valves snap closed to stop it. That snapping echo? That’s your 'Dub.' Think of it as the "Push

Have you ever listened to your heartbeat? That steady isn't just one noise—it’s two different movements working in perfect sync.