What Makes The Lub Sound In The Heart

Following the "lub" is a brief pause, after which the second sound, the "dub," or S2, occurs. This sound signals the start of diastole, the relaxation phase of the cardiac cycle. Once the ventricles have emptied their blood into the lungs and the body, they relax, and the pressure within them drops rapidly. Meanwhile, the blood that has just been pumped out attempts to flow backward due to gravity and pressure changes in the arteries. To prevent this backflow, the exit valves—known as the aortic and pulmonary valves—snap shut. The sudden closure of these two valves creates the shorter, sharper sound of the "dub."

Imagine a water balloon (ventricle) being squeezed: what makes the lub sound in the heart

🩺 The “Lub” is also called the first heart sound (S1) . Following the "lub" is a brief pause, after

Heart sounds are discrete bursts of auditory vibrations of varying intensity (loudness), frequency (pitch), quality, and duration. Wikipedia https://en.wikipedia.org Heart sounds - Wikipedia The papillary muscles are attached to the cusps or leaflets of the tricuspid and mitral valves via chordae tendineae (heart string... Osmosis https://www.osmosis.org Normal heart sounds: Video, Causes, & Meaning - Osmosis Finally, let's move down to between the fifth and sixth rib, so in the left fifth intercostal space, near the midclavicular line. ... YouTube Meanwhile, the blood that has just been pumped