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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...
For example, sympathetic nervous system increases the heart rate, whereas parasympathetic nervous system does the opposite. â¢ Postganglionic fibers of parasympathetic nervous system secrete acetylcholine, while that of sympathetic nervous system secrete adrenaline or noradrenaline at their synapse as neurotransmitters.â¢ Postganglionic sympathetic nerves are adrenergic, whereas postganglionic parasympathetic nerves are cholinergic. Postganglionic fibers of parasympathetic nervous system secrete acetylcholine, while that of sympathetic nervous system secrete adrenaline or noradrenaline at their synapse as neurotransmitters. â¢ Postganglionic sympathetic nerves are adrenergic, whereas postganglionic parasympathetic nerves are cholinergic.