According to the text, what happens to the magnitude of an action potential as it is propagated down an excitable membrane and why?

Question

Quizplus · Accepted Answer

The magnitude of an action potential remains constant as it is propagated down an excitable membrane because of the all-or-nothing principle. Once the threshold is reached, an action potential of a fixed size is generated and this does not diminish as it travels along the membrane.

According to the Text, What Happens to the Magnitude of an Action