(A) The $Vagus$ nerve (Cranial nerve $X$) is a key component of the parasympathetic nervous system. It innervates the $SA$ node of the heart and relea

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(A) The $Vagus$ nerve (Cranial nerve $X$) is a key component of the parasympathetic nervous system. It innervates the $SA$ node of the heart and releases acetylcholine,which acts to decrease the heart rate and inhibit cardiac activity. Therefore,the $Vagus$ nerve is responsible for slowing down the heartbeat.