Physiology of the Immune System

The immune system is the body's defense mechanism against harmful microorganisms like bacteria, viruses, and fungi. It detects invaders through specialized cells and molecules that recognize unique features of these pathogens. Once identified, the immune system activates responses to neutralize or destroy the threats, including producing antibodies and deploying immune cells to attack infected areas. It also retains memory of past infections, allowing faster responses if the same pathogen invades again. Overall, the immune system works continuously to keep us healthy by defending against infections and helping heal injuries.