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HeartCycle

Adaptive test — questions are selected based on your ability estimate.

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What produces the first heart sound (S1, 'lubb')?

Closure of the semilunar valves at the start of ventricular diastole Closure of the atrioventricular valves at the start of ventricular systole Closure of the semilunar valves at the start of ventricular systole Closure of the atrioventricular valves at the start of ventricular diastole

Evaluating…