Define — Active Transport !!top!!

is the movement of molecules or ions across a cell membrane against their concentration gradient—from an area of lower concentration to an area of higher concentration.

Active transport is the energy-dependent movement of molecules from a low-concentration area to a high-concentration area, facilitated by protein pumps that work against the natural tendency toward equilibrium. define active transport

Imagine a salmon fighting its way upstream, leaping against a raging current. It expends enormous energy to move in a direction nature did not intend. Inside every cell of your body, a similar drama unfolds on a microscopic scale. is the movement of molecules or ions across