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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