How does hyperpolarization affect threshold potential?
1 Answer
Jun 9, 2015
Hyperpolarization is the last stage of an action potential. For our purposes, we will consider an action potential in a neuron.
After repolarization, potassium channels remain open longer and the resting membrane potential keeps becoming lower.
Explanation:
This means that it continues to become more negative, in millivolts. Why? Potassium is a positively charged ion ( a cation) so it is leaving the cell; losing positive charges will make the neural membrane more negative.
This situation of hyperpolarization eventually resolves as the sodium/potassium active pumps compensate, and return the membrane to its normal (-90mV) resting membrane potential.
