Final answer:
The statement 'All postganglionic neurons release either norepinephrine or acetylcholine' is true.
Step-by-step explanation:
The statement 'All postganglionic neurons release either norepinephrine or acetylcholine' is true.
Postganglionic neurons are part of the autonomic nervous system. In this system, postganglionic sympathetic fibers release norepinephrine, while postganglionic parasympathetic fibers release acetylcholine.
The difference in the chemical released by these neurons determines the division of the autonomic nervous system that is exerting control over a particular target.
Norepinephrine binds to adrenergic receptors, while acetylcholine binds to muscarinic receptors on target cells.