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The first heart sound, or S 1, forms the "lub" of "lub-dub" and is composed of components M 1 (mitral valve closure) and T 1 (tricuspid valve closure). Normally M 1 precedes T 1 slightly. It is caused by the closure of the atrioventricular valves , i.e. tricuspid and mitral (bicuspid), at the beginning of ventricular contraction, or systole .
The pericardium is a double-walled sac around the heart. The inner and outer (visceral and parietal, respectively) layers are normally lubricated by a small amount of pericardial fluid, but the inflammation of pericardium causes the walls to rub against each other with audible friction. In children, rheumatic fever is often the cause of ...
The normal heart rhythm contains two audible heart sounds called S 1 and S 2 that give the well-known "lub-dub" rhythm; they are caused by the closing of valves in the heart. The first heart sound (S1) is closure of the valve at the end of ventricular filling (the tricuspid and mitral valves); the second heart sound (S2), is closure of the ...
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Heartbeat is the debut studio album by American actor and singer Don Johnson, released on September 30, 1986, by Epic Records. [2] In the United States, the album peaked at number 17 on the Billboard 200 in October 1986 and was certified Gold by the Recording Industry Association of America (RIAA) the following month.
As the heart beats, these pulses are transmitted smoothly via laminar (non-turbulent) blood flow throughout the arteries, and no sound is produced. Similarly, if the cuff of a sphygmomanometer is placed around a patient's upper arm and inflated to a pressure above the patient's systolic blood pressure , there will be no sound audible.
The music video treatment for "Heartbeat" was directed by Hiro Murai and premiered on 14 September 2010. It features the use of an inner throbbing lights and Scherzinger wearing a lace outfit. [ 10 ] The overall concept of the video sees a "shirtless Iglesias against a dark black background, while red and orange 'heartbeats' are added in ...
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