Final answer:
Epinephrine can be used as a neurotransmitter by post-ganglionic sympathetic neurons, binding to α1, α2, β1, and β2 receptors.
Step-by-step explanation:
Post-ganglionic sympathetic neurons can utilize epinephrine as a neurotransmitter. Epinephrine binds to α1, α2, β1, and β2 receptors.
All ganglionic neurons in the autonomic system, both sympathetic and parasympathetic, are activated by acetylcholine (ACh) released from preganglionic fibers. The ACh receptors on these neurons are nicotinic receptors, which are ligand-gated ion channels.
When epinephrine is released by postganglionic sympathetic fibers, it binds to the adrenergic receptors present on the target cell, including α1, α2, β1, and β2 receptors.