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.
Food and feeding. Aardvarks forage for food only at night and mostly find their food underground. They have bad eyesight, but have excellent senses of smell and hearing, which they use to help find termite nests. They walk in zigzags, sniffing the ground and pointing their ears forwards.ood and feeding. Aardvarks forage for food only at night and mostly find their food underground. They have bad eyesight, but have excellent senses of smell and hearing, which they use to help find termite nests. They walk in zigzags, sniffing the ground and pointing their ears forwards.