The following diagram of a nerve action potential applies to Questions :

-At which labeled point on the action potential is $\mathrm{K}^{+}$closest to electrochemical equilibrium?

Question

The following diagram of a nerve action potential applies to Questions :
  
-At which labeled point on the action potential is $\mathrm{K}^{+}$closest to electrochemical equilibrium?

Quizplus · Accepted Answer

[IV E $2 \mathrm{~d}$ ]. The hyperpolarizing afterpotential represents the period during which $\mathrm{K}^{+}$permeability is highest, and the membrane potential is closest to the $\mathrm{K}^{+}$ equilibrium potential. At that point, $\mathrm{K}^{+}$is closest to electrochemical equilibrium. The force driving $\mathrm{K}^{+}$movement out of the cell down its chemical gradient is balanced by the force driving $\mathrm{K}^{+}$into the cell down its electrical gradient.

The Following Diagram of a Nerve Action Potential Applies to Questions