Heartbeat Lub Dub ⭐ Official

: Sometimes a "whooshing" or "swishing" noise is heard between the "lub" and the "dub". This is called a heart murmur , which is the sound of blood flowing through the heart, similar to water moving through a hose.

The "dub" sound marks the end of systole and the beginning of diastole —the phase of ventricular relaxation and filling. heartbeat lub dub

The rhythmic cycle of the human heartbeat is most commonly identified by the onomatopoeic phrase "lub-dub." Far from being a simple noise, this two-part sound is a precise acoustic signature of cardiovascular mechanics. It represents the turbulent closing of the heart’s valves and is the primary indicator of basic cardiac function. : Sometimes a "whooshing" or "swishing" noise is

S1 is typically lower-pitched and longer-lasting than the second sound. The Anatomy of "Dub" (S2) The rhythmic cycle of the human heartbeat is

| Feature | S1 ("Lub") | S2 ("Dub") | | :--- | :--- | :--- | | | Beginning of systole (contraction) | Beginning of diastole (relaxation) | | Valves Closing | Mitral & Tricuspid (AV valves) | Aortic & Pulmonic (Semilunar valves) | | Pitch | Lower | Higher | | Duration | Slightly longer | Slightly shorter | | Best Heard | At the cardiac apex (mitral area) | At the base (2nd intercostal space) |

The "lub-dub" sound of a heartbeat is the sound of your heart valves closing to control blood flow. Each heartbeat consists of two distinct sounds that represent different parts of the cardiac cycle: The "Lub" (First Heart Sound) : This sound, known as