Questions: The beginning of ventricular systole is marked by the first heart sound, corresponding to the closing of the valves, and the beginning of ventricular diastole is marked by the second heart sound, corresponding to the closing of the valves.

The beginning of ventricular systole is marked by the first heart sound, corresponding to the closing of the valves, and the beginning of ventricular diastole is marked by the second heart sound, corresponding to the closing of the valves.

Transcript text: The beginning of ventricular systole is marked by the first heart sound, corresponding to the closing of the $\square$ valves, and the beginning of ventricular diastole is marked by the second heart sound, corresponding to the closing of the $\square$ valves.

Solution

Solution Steps

Step 1: Identifying the first heart sound

The first heart sound, "lub," corresponds to the closing of the atrioventricular (AV) valves.

Step 2: Identifying the second heart sound

The second heart sound, "dub," corresponds to the closing of the semilunar valves.

Final Answer:

The beginning of ventricular systole is marked by the first heart sound, corresponding to the closing of the atrioventricular (AV) valves, and the beginning of ventricular diastole is marked by the second heart sound, corresponding to the closing of the semilunar valves.

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