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The result is an increase in the heart rate. Conversely, stimulating the parasympathetic nervous system (vagal nerves to the heart) increases the resting potential and decreases the rate of diastolic depolarization; under these circumstances the heart rate slows. The...
Activation of sympathetic adrenergic nerves to the heart releases norepinephrine that binds to adrenergic receptors (primarily beta-adrenoceptors), which increases heart rate (positive chronotropy), contractility (positive inotropy) and velocity of electrical impulse conduction (positive dromotropy).