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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...
Parasympathetic & sympathetic systems often have antagonistic effects in each organ. Sweat glands and most vascular smooth muscles have only sympathetic innervation. Ciliary muscle of the eye has only parasympathetic innervation. Bronchial smooth muscle Only parasympathetic innervation: Constriction. Smooth muscle sensitive to circulating adrenaline: Dilation. Salivary glands: Systems produce similar, rather than opposite, effects.