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प्रश्न
When are the sounds ‘LUBB’ and ‘DUB’ produced during heartbeat ?
उत्तर
The first sound ‘LUBB’ is produced when the atrioventricular valves get closed sharply at the start of ventricular systole. The second sound ‘DUB’ is produced at the beginning of ventricular diastole when the semilunar valves, at the roots of aorta and pulmonary artery get closed.
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संबंधित प्रश्न
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Note the relationship between the first two words and suggest a suitable word/words for the fourth place:
Lub : Atrioventricular valves :: Dup : ______
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Heart
