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The conduction system is composed of specialized muscle tissue and initiates and conducts depolarization waves through the myocardium.

Muscle fibers of the ventricular walls are arranged in whirls that squeeze blood out of the ventricles when they contract.

Two separate networks of cardiac fibers regulate atrial and ventricular contraction.

The heart is innervated by the autonomic nervous system, which neither initiates contraction nor affects the cardiac cycle.

Pressure, volume, electrical, and sound changes occur during each cycle.