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曹健
鄭健樂香港先生
友情歲月之山雞故事
Ekin Su Piano
Zhen 祯
幼稚園 鄭姓網紅
古惑仔 2 之猛龍過江 4
赵伊健
Storm Warriors 2 Movie
Ekin Cheng TP Hits
Kuen Cheng 2
Gan Xin Ti Dai NI
Ekin Ceng Top Hits
Chinese Singer Reche
Vinni Cheng
Cheng Dien
Ekin Cheng Top Hits
Cheng Ekin Lonely
0:16
Each heartbeat is made up of two main sounds known as S1 and S2. In this video, you'll see exactly how the S1 sound corresponds to the closing of the mitral and tricuspid valves at the start of ventricular contraction, and how the S2 sound is produced when the aortic and pulmonary valves close as the ventricles relax. This high-precision animation is created by Dr. Bahaa to help medical students understand the exact timing and coordination of heart sounds with valve motion. It's also made easy f
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2 months ago
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smart.doctor
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