Health and Disease Immunity
Health and disease immunity is the body's ability to protect itself against harmful pathogens such as bacteria, viruses, and parasites. It involves the immune system's ability to recognize and destroy these pathogens, preventing them from causing illness or disease. There are two main types of immunity: 1. Innate Immunity: This is the body's natural defense mechanism that provides the initial protection against pathogens. It is present from birth and does not require previous exposure to the specific pathogen. Innate immunity includes physical barriers like the skin, mucous membranes, and chemicals in body fluids such as tears, saliva, and stomach acid. Example: When bacteria enter an open wound, innate immunity responds by activating inflammatory responses. This leads to redness, swelling, and pain, which are typical signs of the body's attempts to fight off the infection. 2. Adaptive Immunity: This type of immunity develops throughout our lives as we encounter various...