Imagine a whole string of voltage-gated sodium channels lined up in a row on a membrane. As the first one reaches threshold and opens, what will happen to the voltage of the cell near
that channel?

The answer is 1. because it just is

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The person who utilize the progression principle will keep adding the difficulty of the exercise that he's doing, while the person who does not, will only stay stagnant.  the person that utilize progression principle, will get a stronger endurance because now his body is conditioned to do harsher routines.{the answer was already on verified)