Identify what causes heart sounds

Medical Terminology for Health Professions, Spiral bound Version (MindTap Course List)
8th Edition
ISBN:9781305634350
Author:Ann Ehrlich, Carol L. Schroeder, Laura Ehrlich, Katrina A. Schroeder
Publisher:Ann Ehrlich, Carol L. Schroeder, Laura Ehrlich, Katrina A. Schroeder
Chapter5: The Cardiovascular Sytem
Section: Chapter Questions
Problem 88LE
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Identify what causes heart sounds 

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Heart sounds refer to the sounds produced by the heart while beating. These sounds are the result of the snap shut of valves of the heart.  There are two distinct sounds produced by the heart that are S1 and S2, first and second heart sound respectively. The first sound is produced as the atrioventricular valves close, while the second sound is produced when semilunar valves close.

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