Concentration gradient in biology

A concentration gradient in biology refers to the difference in the amount of a substance, like molecules or ions, between two areas. For example, if there’s a high concentration of oxygen inside your lungs and a lower concentration in your blood, oxygen naturally moves from the higher to the lower area. This movement occurs because particles spread out to balance levels, a process called diffusion. Concentration gradients are essential for many biological functions, helping substances move efficiently across cell membranes and within the body to support life processes.