Transport: Definition For Active

Because this movement goes "against the grain"—or more scientifically, —it does not happen spontaneously. To achieve this, the cell must expend energy, usually in the form of Adenosine Triphosphate (ATP) . Think of it like moving a ball:

Understanding Active Transport: Definition, Types, and Biological Importance definition for active transport

Active transport is a type of transport across cell membranes that requires energy. It involves the movement of molecules or ions from an area of lower concentration to an area of higher concentration, against the concentration gradient. Because this movement goes "against the grain"—or more

Nerve cells must maintain specific levels of sodium and potassium ions to fire electrical impulses. the cell must expend energy