An action potential is a very rapid change in membrane potential that occurs when a nerve cell membrane is stimulated. Specifically, the membrane potential goes from the resting potential (typically -70 mV) to some positive value (typically about +30 mV) in a very short period of time (just a few milliseconds).n action potential is a very rapid change in membrane potential that occurs when a nerve cell membrane is stimulated. Specifically, the membrane potential goes from the resting potential (typically -70 mV) to some positive value (typically about +30 mV) in a very short period of time (just a few milliseconds).
Definition of astute - having or showing an ability to accurately assess situations or people and turn this to one's advantage Definition of astute - having or showing an ability to accurately assess situations or people and turn this to one's advantage
Definition of subtle for English Language Learners. : 1  hard to notice or see : not obvious. : 2  clever and indirect : not showing your real purpose. : 3  having or showing skill at recognizing and understanding things that are not obvious.