11. Nervous Tissue and Nervous System

Which of the following electrical events occurs when a certain threshold is reached?

Which of the following is characteristic of an action potential?

An action potential is a phenomenon that either happens completely or doesn't happen at all.

The anatomical region of a multipolar neuron where the AP is initiated is the a. soma, b. dendrites, c. axon's initial segment, d. axon terminals.

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?

What is the polarized membrane state? How is it maintained? (Note the relative roles of both passive and active mechanisms.)

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.