During Which Phase of the Action Potential Do the Voltage-Sensitive

question 5

Multiple Choice

During which phase of the action potential do the voltage-sensitive ion channels return to their pre-depolarization permeability?

• A) Phase 0
• B) Phase 4
• C) Phase 3
• D) Phase 5

---

Definitions:

Neurotransmitters

Chemical messengers that transmit signals across a chemical synapse from one neuron (nerve cell) to another target neuron, muscle cell, or gland cell.

Myelin

A fatty white substance that surrounds the axon of some nerve cells, forming an electrically insulating layer and speeding up the transmission of nerve impulses.

Presynaptic Neuron

The neuron that releases neurotransmitters from its terminal buttons to communicate with a postsynaptic neuron across a synapse.

Neurotransmitters

Chemical messengers in the nervous system that transmit signals across the synapse from one neuron to another.