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).eurons can respond to stimuli and conduct impulses because a membrane potential is established across the cell membrane. In other words, there is an unequal distribution of ions (charged atoms) on the two sides of a nerve cell membrane.
Aardvarks are small pig-like mammals that are found inhabiting a wide range of different habitats throughout Africa, south of the Sahara. They are mostly solitary and spend their days sleeping in underground burrows to protect them from the heat of the African sun, emerging in the cooler evening to search for food.
That quick blur out of the corner of your eye that left you wondering if youâre seeing things. Odds are that blur was Mustela vison, the mink. Mink are ferocious predators that are about the size of a housecat and chocolate-brown in color. Their long, thin bodies, short legs, small eyes and ears, and sleek fur make them just the right size to fit in many holes, crevices and burrows to pursue prey.