Related Experiment Video
Updated: Jul 5, 2026

08:32
Adapting Human Videofluoroscopic Swallow Study Methods to Detect and Characterize Dysphagia in Murine Disease Models
Published on: March 1, 2015
Transesophageal echocardiography: clinical indications and applications
Gail E Peterson1, M Elizabeth Brickner, Sharon C Reimold
1Department of Internal Medicine, Cardiology, University of Texas Southwestern Medical Center, Dallas, Tex, USA.
Circulation
|May 21, 2003
Abstract
No abstract available in PubMed .
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S1, also known as the "lub" sound, is caused by the closure of atrioventricular (A-V) valves at the...
Auscultation is the process of listening to these internal body sounds using a stethoscope. The heart produces four types of sounds, but only two—S1 and S2—can usually be heard with a stethoscope.
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Endoscopy is a non-surgical medical technique used to examine a person's internal organs and vessels. This lesson will focus on two types of endoscopic studies: bronchoscopy and thoracoscopy.
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Normal Heart Sounds
S1 (First Heart Sound)-
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Normal Heart Sounds
S1 (First Heart Sound)-
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