Which valve activity is associated with S1, the first heart sound?

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Multiple Choice

Which valve activity is associated with S1, the first heart sound?

Explanation:
S1 is produced when the ventricles start to contract and the atrioventricular valves snap shut to prevent blood from flowing back into the atria. This sudden closure of the mitral and tricuspid valves marks the beginning of ventricular systole and creates the first heart sound. By contrast, the semilunar valves close later, producing the second heart sound, and openings of either valve are generally silent. So the valve activity tied to S1 is the closure of the atrioventricular valves.

S1 is produced when the ventricles start to contract and the atrioventricular valves snap shut to prevent blood from flowing back into the atria. This sudden closure of the mitral and tricuspid valves marks the beginning of ventricular systole and creates the first heart sound. By contrast, the semilunar valves close later, producing the second heart sound, and openings of either valve are generally silent. So the valve activity tied to S1 is the closure of the atrioventricular valves.

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