Parasympathetic Effects Are Localized and Short-Lived Because

Multiple Choice

Parasympathetic effects are localized and short-lived because

A) muscarinic receptors are deactivated by norepinephrine.
B) acetylcholine is inactivated at the synapse by acetylcholinesterase.
C) norepinephrine hyperpolarizes the postganglionic membrane.
D) norepinephrine is inactivated at the synapse by monoamine oxidase.
E) epinephrine blocks the muscarinic receptors.