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.
Answer #1   Humans eat narwhals. Polar bears, sharks, killer whales and walruses eat them too!   Answer #2 by Shabootaqay   Orca whales are the narwhals' greatest nat â¦ ural predators.Narwhals avoid the orcas by staying in the cracks between glaciers in the winter. Answer #3   Eskimos, killer whales, and polar bears.   polar bear Polar bears, orcas, and Greenland sharks have been known to hunt narwhals, but their biggest predator is man. Polar bears and Walruses.