The first part of the cardiac cycle is called:

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Multiple Choice

The first part of the cardiac cycle is called:

The first part of the cardiac cycle is atrial depolarization. This electrical event triggers the atria to contract and push blood into the ventricles, initiating the cycle. In an ECG, atrial depolarization corresponds to the P wave, which occurs before the atria actually contract. Atrial contraction follows this depolarization and fills the ventricles, setting the stage for the next phase of the cycle—the ventricles depolarizing and contracting. So the initial step is the atrial electrical activity that starts the sequence, making atrial depolarization the correct concept for the first part of the cycle.

The first part of the cardiac cycle is atrial depolarization. This electrical event triggers the atria to contract and push blood into the ventricles, initiating the cycle. In an ECG, atrial depolarization corresponds to the P wave, which occurs before the atria actually contract. Atrial contraction follows this depolarization and fills the ventricles, setting the stage for the next phase of the cycle—the ventricles depolarizing and contracting. So the initial step is the atrial electrical activity that starts the sequence, making atrial depolarization the correct concept for the first part of the cycle.

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