How has technology reduce the spread of infectious disease?
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Ответ:
Ответ:
Option D.
Semilunar valves closing.
Explanation:
Heart sounds refer to the noises produced when the heart beat and blood flow through the heart.
The second heart sounds called dub is produced when semilunar valves closes which are the aortic and pulmonary valves. The sound produced by the closure of aortic verve is called A2 and the sound produced by the closing pulmonary verve is called p2. The A2 sound is Louder than the P2 sound because of the high pressure in the left chamber of the heart.