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One of the most vital examples of this process is the (Na⁺/K⁺-ATPase), which is found in the membranes of almost every human cell. The Mechanism of the Sodium-Potassium Pump

When a white blood cell encounters a bacterium, it reaches out and "swallows" it whole. This is a form of active transport called phagocytosis.

This specific example of active transport is essential for several reasons:

Cells need to move molecules in and out to survive. Sometimes, this movement is easy—molecules flow naturally from areas of high concentration to low concentration (like water flowing downstream). This is passive transport. But frequently, cells need to move molecules —from an area of low concentration to high concentration.

Active transport is the unsung hero of biology. While passive transport is efficient, it is passive—it waits for things to happen. Active transport allows organisms to take control of their internal environment.