Heart beat
From DrKoop's partner site on heart disease, MyHeartCentral.com
Two distinguishable sounds can be heard during the cycle of the beating heart when listened to with a stethoscope. The heart sounds are usually described as a lup-dup sound. These sounds are due to the closing of the valves of the heart. Unusual heart sounds are called murmurs.
Review Date: 11/06/2006  advertisement
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