Which of these statements describes a threshold potential
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

Threshold potential is defined as the membrane potential at which there is an explosive increase in Na⁺ permeability, leading to depolarization and initiation of an action potential. Option A describes the concept of electrochemical equilibrium, option B describes the peak potential of an action potential, and option D describes the point at which K⁺ permeability increases, which occurs during the repolarization phase of an action potential.

Which of These Statements Describes a Threshold Potential