Active Transport

Imagine rolling a heavy stone uphill. You need to push hard and use energy because gravity pulls it down. Similarly, moving molecules from low to high concentrations in your body requires energy. This process is called active transport.

Unlike diffusion, where molecules flow naturally from high to low concentration, active transport works against this flow by consuming energy.

The primary energy source for active transport is Adenosine triphosphate or ATP, a molecule that powers many cellular processes.

Molecules need carrier proteins embedded in the cell membrane to move against their concentration gradients. These proteins act like pumps, using energy to move molecules.

For example, the sodium-potassium pump uses ATP and moves three sodium ions out of the cell and two potassium ions into the cell against their concentration gradient.

Active transport is essential for maintaining ionic balance inside cells, which is necessary for functions such as transmitting information through nerves and facilitating muscle movement.