Here's a breakdown of how it works:
* Innate Immunity: This is the first line of defense, a non-specific response that acts immediately. It includes physical barriers like skin and mucous membranes, as well as cells like macrophages and neutrophils that engulf and destroy pathogens.
* Adaptive Immunity: This is a specific response that develops over time and is tailored to target particular pathogens. It involves:
* Lymphocytes: These are white blood cells that recognize specific antigens (molecules on the surface of pathogens).
* Antibodies: Proteins produced by B lymphocytes that bind to antigens and neutralize pathogens.
* T cells: These cells directly attack infected cells or help other immune cells.
The immune system is a complex network of cells and molecules that work together to protect the body from infection. It's constantly learning and adapting to new threats, making it crucial for maintaining health.
