Most people know about (diffusion), where substances flow downhill from high to low concentration without using energy. But what happens when a cell needs to move a substance against its concentration gradient—from low to high concentration?
Every living cell is a bustling city, constantly importing raw materials (like glucose and amino acids) and exporting waste (like sodium and calcium). To move these substances across its waterproof membrane, the cell relies on a sophisticated logistics system. Most people know about (diffusion), where substances flow
This is where comes in. However, not all active transport is the same. Biologists split it into two distinct categories: Primary Active Transport and Secondary Active Transport . Most people know about (diffusion)