What protects your body from infectious diseases?

The immune system protects the body from infectious diseases. The immune system is a complex network of cells, tissues, and organs that work together to recognize and destroy foreign invaders, such as bacteria, viruses, and parasites.

There are two main types of immune responses: innate immunity and adaptive immunity. Innate immunity is the body's first line of defense against infection and is present from birth. It includes physical barriers, such as the skin and mucous membranes, as well as chemical barriers, such as stomach acid and saliva. Innate immunity also includes cells such as macrophages and natural killer cells, which can recognize and destroy foreign invaders.

Adaptive immunity is more specialized and develops over time as the body is exposed to new pathogens. It involves the production of antibodies, which are proteins that can bind to specific antigens on the surface of pathogens and mark them for destruction. Adaptive immunity also includes the development of memory cells, which can quickly recognize and destroy pathogens that the body has previously encountered.

The immune system is constantly adapting and learning from new threats. It is a complex and dynamic system that is essential for maintaining health and preventing disease.