The first consequence of a neuron's reaching threshold for an action potential is the opening of _________ channels.
A) voltage-dependent sodium
B) voltage-dependent potassium
C) ligand-gated sodium
D) ligand-gated potassium

Question

Quizplus · Accepted Answer

When a neuron reaches threshold for an action potential, voltage-dependent sodium channels open first, allowing a rush of sodium ions into the cell which depolarizes the membrane and triggers the action potential to propagate down the axon. Ligand-gated channels are not involved in the initial phase of the action potential. Potassium channels will open later, repolarizing the membrane and returning it to its resting state.

The First Consequence of a Neuron's Reaching Threshold for an Action