Applying tetrodotoxin to a neuron prevent nerve impulses from firing by:
A) producing inhibitory postsynaptic potentials.
B) destroying axon terminals.
C) blocking sodium channels.
D) preventing neurotransmitter reuptake.

Question

Quizplus · Accepted Answer

Tetrodotoxin is a potent neurotoxin that specifically blocks voltage-gated sodium channels in the axon membrane, which are responsible for the initiation and conduction of action potentials. By blocking sodium channels, tetrodotoxin prevents the entry of sodium ions into the neuron, which in turn prevents the depolarization needed to generate an action potential and therefore inhibit nerve impulses from firing.

Applying Tetrodotoxin to a Neuron Prevent Nerve Impulses from Firing