Lub — Dub Sounds Systole Diastole __link__

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 .

The sounds associated with the heartbeat are clinically known as and S2 . These are not the sounds of the muscle contracting, but rather the sound of heart valves snapping shut to prevent the backflow of blood. lub dub sounds systole diastole

The "lub" sound, or , is the first and typically lower-pitched, longer-lasting sound in the pair. Lub dub (video) | Circulatory system May 5, 2014 Khan Academy·khanacademymedicine Diastole