Host defense mechanisms

Host defense mechanisms are the body's natural systems that protect against harmful microorganisms like bacteria and viruses. The immune system identifies and targets invaders, using barriers like the skin and mucous membranes to block entry. If invaders weave through, immune responses such as white blood cells, antibodies, and inflammation work to eliminate them. These defenses also remember past infections, enabling quicker responses next time. Overall, host defenses are essential for maintaining health by detecting, neutralizing, and removing pathogens to prevent illness.