Which of the following is a true statement regarding the neurotransmitters of the ans? check all that apply. check all that apply all preganglionic neurons of the ans are cholinergic. all preganglionic neurons of the ans are cholinergic. all postganglionic neurons of the ans are adrenergic. all postganglionic neurons of the ans are adrenergic. all postganglionic neurons of the ans have cholinergic receptors. all postganglionic neurons of the ans have cholinergic receptors. postganglionic sympathetic neurons release norepinephrine to the heart muscle cells. postganglionic sympathetic neurons release norepinephrine to the heart muscle cells. some ans neurons use dopamine as their neurotransmitter.