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.
A predator is an animal that eats other animals â or people or companies who act like they do. Lions are predators, but so are pickpockets and some giant corporations. The word predator started out referring to insects that ate other insects, but has grown to include any animal that eats another animal. We humans like to think of ourselves as the top of the food chain, but scary movies love to disagree, like in the 1987 movie Predator, where creepy aliens try to kill and eat us. Predators don't have to kill and eat you, though; they can also just take your stuff.