Once the threshold is reached as a cell depolarizes A) K⁺channels open. B) Na⁺ channels close. C) an action potential is triggered. D) the interior of the cell becomes negative with respect to the outside.

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Quizplus · Accepted Answer

Once the threshold is reached, an action potential is triggered. This is the point at which the membrane potential reaches a certain level of depolarization that triggers a rapid, all-or-nothing depolarization of the membrane potential, resulting in an action potential. K+ channels opening and Na+ channels closing are both processes that contribute to repolarization of the membrane following the action potential, rather than triggering it. The interior of the cell becoming negative with respect to the outside is a normal state for cells and does not change with depolarization alone.

Once the Threshold Is Reached as a Cell Depolarizes