Describe the events that must occur to generate an AP. Relate the sequence of changes in permeability to changes in the ion channels, and explain why the AP is an all-or-none phenomenon. Since all APs...

Describe the events that must occur to generate an AP. Relate the sequence of changes in permeability to changes in the ion channels, and explain why the AP is an all-or-none phenomenon.

Since all APs generated by a given nerve fiber have the same magnitude, how does the CNS “know” whether a stimulus is strong or weak?