Gujarat BoardEnglish MediumSTD 11 ScienceBIOLOGYMODEL PAPER 93 Marks
Question
Explain heart sounds.
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Answer
The heart sounds are the noises $($sound$)$ generated by the beating heart and the resultant flow of blood through it. This is also called a heartbeat. In cardiac auscultation, an examiner uses a stethoscope to listen for these sounds, the heartbeat sounds like bassdrum, which provide important information about the condition of the heart.
In healthy adults, there are two normal heart sounds often described as a lub and a dub $($or dup$),$ that occur in sequence with each heart beat. These are the first heart sound $(S_1)$ and second heart sound $(S_2),$ produced by the closing of the $AV$ valves and semilunar valves respectively. In addition to these normal sounds, a variety of other sounds may be present including heart murmurs, adventitious sounds, and gallop rhythms $33$ and $54.$
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