Glossary of Medical Terms

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HEART SOUNDS

The sounds heard over the cardiac region produced by the functioning of the heart. There are four distinct sounds: the first occurs at the beginning of systole and is heard as a "lubb" sound; the second is produced by the closing of the aortic and pulmonary valves and is heard as a "dupp" sound; the third is produced by vibrations of the ventricular walls when suddenly distended by the rush of blood from the atria; and the fourth is produced by atrial contraction and ventricular filling but is rarely audible in the usual heart. The physiological concept of heart sounds is differentiated from the pathological heart murmurs.
inferior vesical nerves   inferior vesical plexus   inferior vestibular area   inferior vestibular nucleus   inferior wall of orbit   inferior wall of tympanic cavity   inferobranchian   inferobranchiata   (0)
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