Which of the following statements accurately describe events that occur as a result of a local potential reaching threshold? A) Activation gates of Na⁺ channels begin to close. B) Inactivation gates of Na⁺ channels begin to open. C) A positive feedback cycle develops in which depolarization causes activation gates of Na⁺ channels to open. D) K⁺ channels begin to close. E) Both "Inactivation gates of Na⁺ channels begin to open" and "A positive feedback cycle develops in which depolarization causes activation gates of Na⁺ channels to open" are correct.

Question

Quizplus · Accepted Answer

EWhen a local potential reaches threshold, a positive feedback cycle develops in which depolarization causes the activation gates of sodium channels (Na+) to open, leading to further depolarization. This is accurately described in option C. Additionally, option E is correct because it includes the correct statement from option C and adds that the inactivation gates of Na+ channels begin to open, which is part of the process that eventually leads to the repolarization phase of the action potential.

Which of the Following Statements Accurately Describe Events That Occur