Question

Action potentials begin by the ____________. opening of ligand-activated potassium channels. closing of ligand-activated potassium channels. closing of voltage-activated calcium channels. opening of voltage-activated sodium channels. closing of ligand-activated chloride channels.

Answer 1

Action Potentials begin by the actions of both the opening of the voltage gated sodium channels and the closing of the sodium channels, and then opening of the potassium voltage gates channels.