The first heart sound (S1) is produced by the closure of which valves?

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Prepare for the Ivy Tech Anatomy and Physiology II (APHY 102) Heart Test with multiple-choice questions, detailed explanations, and study resources. Enhance your understanding and excel in your exam!

Multiple Choice

The first heart sound (S1) is produced by the closure of which valves?

Explanation:
S1 occurs at the start of ventricular systole and is produced by the closing of the two atrioventricular valves—the mitral valve on the left and the tricuspid valve on the right. When the ventricles contract, their pressure rises above the atria, forcing these valves to snap shut and prevent backflow. The sudden closure and tension of the valve leaflets generate the vibrations we hear as the first heart sound. In contrast, the semilunar valves (aortic and pulmonary) close later in the cycle, producing the second heart sound. That’s why S1 is linked specifically to the mitral and tricuspid valves.

S1 occurs at the start of ventricular systole and is produced by the closing of the two atrioventricular valves—the mitral valve on the left and the tricuspid valve on the right. When the ventricles contract, their pressure rises above the atria, forcing these valves to snap shut and prevent backflow. The sudden closure and tension of the valve leaflets generate the vibrations we hear as the first heart sound. In contrast, the semilunar valves (aortic and pulmonary) close later in the cycle, producing the second heart sound. That’s why S1 is linked specifically to the mitral and tricuspid valves.

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