In general the parasympathetic nervous system's effects on the heart are to reduce activity through its release of acetycholine and binding with muscarinic receptors,but there is no significant effect observed on the ventricular cardiac muscle,compared to other parts of the heart.

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The parasympathetic nervous system primarily affects the sinoatrial node and atrioventricular node, reducing heart rate and conduction velocity, but it has minimal direct effect on ventricular muscle contractility.

In General the Parasympathetic Nervous System's Effects on the Heart