Which of these statements concerning a threshold potential is correct? A)It is the potential achieved when two opposing forces acting upon an ion (concentration and electrical gradients) achieve a state of equilibrium. B)It is the peak potential achieved during an action potential. C) It is the point at which there is an explosive increase in Na⁺ permeability. D) It is the potential at which K⁺ permeability increases.

Question

Quizplus · Accepted Answer

The threshold potential is the point at which there is an explosive increase in Na+ permeability, leading to depolarization and initiation of an action potential. Option A describes the equilibrium potential, B describes the peak of the action potential, and D is incorrect as K+ permeability actually decreases during depolarization.

Which of These Statements Concerning a Threshold Potential Is Correct