Alpha-bungarotoxin is a snake toxin that is a nicotinic antagonist. If someone were injected with alpha-bungarotoxin, which of the following cells would most directly have their activity affected?
A) effectors of both the parasympathetic and sympathetic branches
B) preganglionic neurons in both the parasympathetic and sympathetic branches
C) postganglionic neurons in both the parasympathetic and sympathetic branches
D) effectors of the sympathetic branch only

Question

Quizplus · Accepted Answer

Alpha-bungarotoxin is a nicotinic antagonist, meaning it blocks the activity of nicotinic acetylcholine receptors (nAChRs). nAChRs are found on ganglion cells, which include both preganglionic and postganglionic neurons in both the parasympathetic and sympathetic branches. Therefore, if someone were injected with alpha-bungarotoxin, the activity of both the preganglionic and postganglionic neurons in both the parasympathetic and sympathetic branches would be directly affected.

Alpha-Bungarotoxin Is a Snake Toxin That Is a Nicotinic Antagonist