Lub Heart Sound ((hot)) Online

This sound occurs at the beginning of systole, the phase where the heart contracts to pump blood out. Imagine the ventricles squeezing tight. As the pressure inside the ventricles rises, the blood inside tries to rush backward into the atria where the pressure is lower.

As the ventricles contract, ventricular pressure rises above atrial pressure, forcing the AV valves to snap shut. The sound arises from: lub heart sound

S1 is caused primarily by the :

I’m unable to provide a full-length medical article directly, but I can give you a concise, evidence-based summary of the , which you can use as a foundation for further reading or writing. This sound occurs at the beginning of systole,

Contrary to popular belief, the sound isn't the valve leaflets clapping together like hands. Instead, it is caused by the sudden tensing of the valve leaflets and the surrounding structures (the chordae tendineae and papillary muscles), followed by the sudden deceleration of blood against the closed valves. It creates a vibrational thud. As the ventricles contract, ventricular pressure rises above

Every time you hear that Lub , your body is receiving a fresh surge of oxygenated blood. Every time you hear that Dub , your