What is thought to cause the sodium channels that initiate an action potential to be inactivated for a brief time after being open for about 1 msec?
A)a higher positive charge
B)a higher negative charge
C)the random diffusion of an inactivation peptide into the opening of the channel pore
D)removal of a peptide from the channel protein
E)covalent addition of a peptide to the cytoplasmic end of the channel protein

Question

Quizplus · Accepted Answer

The inactivation of sodium channels is caused by the random diffusion of an inactivation peptide into the opening of the channel pore, which blocks the passage of sodium ions through the channel. This inactivation peptide is rapidly removed from the pore, allowing the channel to recover its ability to conduct sodium ions.

What Is Thought to Cause the Sodium Channels That Initiate