試題詳解

44. A nerve signal begins as a change of membrane potential occurred. Which one below is invalid about the change of membrane potential?
(A) Before the change, the resting potential is maintained by the sodium-potassium pumps.
(B) Once the nerve was excited, more potassium channels opened, and more sodium channels closed thus the membrane potential changed.
(C)The changes of ion concentrations after the excitement of nerve, it causes the depolarization across inside and outside of the membrane.
(D) To see depolarization happens, the stimulation needs to reach a threshold.
(E) Finally, the membrane repolarized into a status that interior of cell is more negatively charged.