The sounds that are made when the heart valves close and open are called heart sounds. A normal heart makes two distinctive sounds during each cardiac cycle, the first sound is called lub and the second sound is called dub.
• Lub: This sound is produced by the closing of the tricuspid and bicuspid valves at the beginning of the systole.
• Dub: This sound is produced by the closing of the half-moon keys at the beginning of the diastole.Answered by Pragya Singh | 1 year ago
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