The depolarization phase is due to the opening and closing of Blank______ ion channels.Multiple choice question.enzyme-gatedvoltage-gatedligand-gated

Voltage-gated sodium channels close and inactivation gates open at the end of Blank______.Multiple choice question.depolarizationrepolarization

When the voltage-gated potassium channels open, a large number of potassium ions Blank______ the cell, resulting in the Blank______ phase of the action potential.Multiple choice question.exit, depolarizationexit, repolarizationenter, depolarizationenter, repolarization

oltage-gated sodium channels close and inactivation gates open at the end of Blank______.Multiple choice question.repolarizationdepolarization

After stimulation, positive ions enter the cell. This causes the membrane to Blank______.Multiple choice question.depolarizehyperpolarizebecome less permeablerepolarize

Select all that applyOnce a cell's threshold has been reached Blank______.Multiple select question.the sodium voltage-gated channels close rapidlythe sodium voltage-gated channels open rapidlythe repolarization phase beginsthe potassium voltage-gated channels close rapidlythe depolarization phase begins