A Toxin That Binds Specifically to Voltage-Gated Sodium Channels in Axons

question 26

Multiple Choice

A toxin that binds specifically to voltage-gated sodium channels in axons would be expected to

• A) prevent the hyperpolarization phase of the action potential.
• B) prevent the depolarization phase of the action potential.
• C) prevent graded potentials.
• D) increase the release of neurotransmitter molecules.
• E) have most of its effects on the dendritic region of a neuron.

---

Definitions:

Behavior

The actions or reactions of an organism or system, often in response to external stimuli, encompassing a wide range of activities and responses.

Survival of the Fittest

A concept in natural selection suggesting that individuals or species that are most adaptable to their environment have a better chance of surviving and reproducing.

Charles Darwin

A 19th-century English naturalist, geologist, and biologist best known for his contributions to the science of evolution by natural selection.

Species

A group of living organisms consisting of similar individuals capable of exchanging genes or interbreeding, forming the principal natural taxonomic unit below a genus.