Final answer:
Cholinergic neurons use acetylcholine to transmit signals in the nervous system. Examples include preganglionic neurons in the autonomic nervous system and the neuromuscular junction.
Step-by-step explanation:
Cholinergic neurons are a type of neurons that use the neurotransmitter acetylcholine to transmit signals. They are found in various parts of the nervous system, including the autonomic nervous system and the brain.
Examples of cholinergic neurons include the preganglionic neurons of both the sympathetic and parasympathetic divisions of the autonomic nervous system. These neurons release acetylcholine to communicate with their postganglionic neurons, which may have nicotinic receptors (as in the sympathetic division) or muscarinic receptors (as in the parasympathetic division).
Another example is the cholinergic synapse at the neuromuscular junction (NMJ), where motor neurons release acetylcholine to stimulate muscle contractions.