During the absolute refractory period, which of the following is true?

The ________ is the period of time during which it is impossible to stimulate a neuron to have an action potential, whereas the ________ is the period of time during which a larger-than-normal stimulus is required to elicit an action potential.

What is the functional difference among chemically gated (ligand-gated), voltage-gated, and mechanically gated ion channels?

What factor determines the maximum frequency of action potentials that could be propagated by an axon?

During the relative refractory period, a larger-than-normal depolarizing stimulus can __________.