Explain how active transport a nerve cell maintain it's resting potential

Active Transport definition:  movement of materials across a membrane that requires an input of energy from a cell.

Active transport of ions across the nerve cell membrane maintains a cell's resting potential. Even at rest, nerve cell membranes have an electrical potential-that is, the interior of a nerve cell has a negative electrical charge relative to the cell's external environment, which is positive.

The electrical potential that exists in a nerve cell membrane when it is at rest is called a resting potential. That resting potential is maintained by an active transport mechanism called the sodium-potassium pump. The sodium-potassium pump is a series of proteins embedded in the cell's membrane. It uses the energy of ATP to move sodium ions -NaK- out of the cell and potassium ions -KK- into the cell.

When a flash of energy is required to move materials through a cell membrane, it is called active transport. The cell membrane helps an organism respond to its environment. Cell membranes are key structures that help organisms maintain homeostasis.

he forelimbs below belong to four species that descended in a direct line from the ancestral mammal shown above. of the four descendants shown, which species most likely appeared earliest in evolutionary history?