Question
Question: Doctors use stethoscopes to hear the sound produced during each cardiac cycle. The second sound is h...
Doctors use stethoscopes to hear the sound produced during each cardiac cycle. The second sound is heard when
Solution
The normal sound of the heart that can be heard through the stethoscope is the "lub-dub”. It is the basic sound of the heart that can be obtained as a result of each cardiac cycle.
Complete step by step answer: The stethoscope helps the doctor to hear sounds that are produced during each cardiac cycle. The next sound is heard when the semilunar valves close down after the blood flows into the vessels from the ventricles. The heart sounds are noises generated by the beating of the heart and a resultant flow of the blood which passes through it. Specifically, the sounds reflect turbulence created when a heart valve snaps shut. During cardiac auscultation, an examiner may use the stethoscope to listen for these unique and distinct sounds that provide important auditory data regarding the condition of the heart. In healthy adults, two normal heartbeat sounds can listen which is described lub and a dub, which occurs in the sequence with each of the heartbeats. These are the first heart sounds and the next heart sound, produced by the closing of the atrioventricular valves and the semilunar valves, respectively. Moreover, in these normal sounds, the variety of other sounds may be present including the heart murmurs, adventitious sounds, and also the gallop rhythms.
Note: The rarer extra heart sounds from the gallop rhythms are heard in both the normal and the abnormal situations. With the help of these electronic stethoscopes, it is possible to record the heart sounds by giving the direct output to an external recording device, such as a laptop or the MP3 recorder.