(C) The vagus nerve ($10^{th}$ cranial nerve) is a key component of the parasympathetic nervous system.Stimulation of the vagus nerve releases acetylc

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(C) The vagus nerve ($10^{th}$ cranial nerve) is a key component of the parasympathetic nervous system.Stimulation of the vagus nerve releases acetylcholine,which acts on the $SA$ node to decrease the heart rate.Therefore,stimulation of the vagus nerve will make the heart beat slower.