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In cardiac circulation, “ dupp” sound is heard, when
a. Mitral valves closes
b. Mitral valves open
c. Semilunar valves closes
d. Tricuspid valve closes

Last updated date: 16th Jun 2024
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Hint: Heart sounds are the noises generated through the beating heart and the consequent go with the flow of blood through it, the sounds replicate the turbulence created while the heart valves snap close. In cardiac auscultation, an examiner can also use a stethoscope to pay attention to those particular and wonderful sounds that offer critical auditory statistics concerning the circumstance of the coronary heart.

Complete answer:
• In wholesome adults, there are normal coronary heart sounds, often described as a lub and a dub that occur in collection with every heartbeat.
• These are the primary heart sound $(S_1)$ and 2nd coronary heart sound $(S_2)$, produced by way of the final of the atrioventricular valves and semilunar valves.
• In addition to those normal sounds, a spread of other sounds can be present inclusive of coronary heart murmurs, adventitious sounds, and gallop rhythms S3 and S4.
• The first coronary heart sound, or $S_1$, bureaucracy the "lub" of "lub-dub" and is composed of components M1 (mitral valve closure) and T1 (tricuspid valve closure). It is because of the closure of the atrioventricular valves, i.E. Tricuspid and mitral (bicuspid), at the beginning of the ventricular contraction, or systole.
• The 2nd coronary heart sound, or $S_2$, forms the "dub" of "lub-dub" and is composed of components A2 (aortic valve closure) and P2 (pulmonary valve closure).
• It is due to the closure of the semilunar valves (the aortic valve and pulmonary valve) on the give up of ventricular systole and the start of ventricular diastole

Hence, the correct answer is option (C).

Note: Heart clicks are brief, excessive-pitched sounds that may be preferred with modern non-invasive imaging strategies. The pericardial friction rub may be heard in pericarditis, an irritation of the pericardium, the sac surrounding the heart. This is a characteristic scratching, creaking, excessive-pitched sound emanating from the rubbing of each layer of the inflamed pericardium. It is the loudest in systole, but can regularly be heard at the start and on the stop of diastole.