Heart sound
Heart sound
Heart sound refers to the noise produced by the beating heart and the resultant flow of blood through it. Specifically, the sounds reflect the turbulence created when the heart valves snap shut. In cardiology, the sounds are often used as indicators of heart health.
Pronunciation
Heart sound: /ˈhɑːrt saʊnd/
Etymology
The term "heart sound" is derived from the Old English 'heorte' for heart and the Middle English 'soun' for sound.
Description
Heart sounds are the noises generated by the beating heart and the resultant flow of blood through it. In cardiology, the sounds are often used as indicators of heart health. The two main heart sounds are often described as "lub" and "dub" (or "lubb" and "dubb"). The first heart sound, or "lub", is caused by turbulence caused by the closure of mitral and tricuspid valves at the start of systole. The second heart sound, or "dub", is caused by the closure of aortic and pulmonic valves, marking the beginning of diastole.
Related terms
- Systole: The phase of the heartbeat when the heart muscle contracts and pumps blood from the chambers into the arteries.
- Diastole: The phase of the heartbeat when the heart muscle relaxes and allows the chambers to fill with blood.
- Mitral valve: One of four valves in the heart, located between the left atrium and the left ventricle.
- Tricuspid valve: One of four valves in the heart, located between the right atrium and the right ventricle.
- Aortic valve: One of four valves in the heart, located between the left ventricle and the aorta.
- Pulmonic valve: One of four valves in the heart, located between the right ventricle and the pulmonary artery.
See also
- Heart murmur: An unusual sound heard between heartbeats.
- Cardiology: The study of the heart and its functions in health and disease.
External links
- Medical encyclopedia article on Heart sound
- Wikipedia's article - Heart sound
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