Tetrodotoxin Is a Toxin That Blocks Voltage-Gated Sodium Channels

question 214

Multiple Choice

Tetrodotoxin is a toxin that blocks voltage-gated sodium channels.What effect does this substance have on the function of neurons?

• A) Neurons depolarize more rapidly.
• B) Action potentials lack a repolarization phase.
• C) The absolute refractory period is shorter than normal.
• D) The neuron is not able to propagate action potentials.
• E) The toxin does not interfere with neuron function because the voltage-regulated sodium channels would still function.

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