What is the primary function of the immune system?

The primary function of the immune system is to defend the body against pathogens and disease-causing agents. This includes a wide range of organisms such as viruses, bacteria, fungi, and parasites. The immune system is composed of various cells, tissues, and organs that work together to identify and eliminate these harmful invaders. This defense mechanism is critical for maintaining the body's health and preventing infections.

When pathogens enter the body, the immune system is activated to recognize them and mount specific responses. These responses may include the production of antibodies, the activation of immune cells that can directly attack pathogens, and the coordination of other aspects of the immune response to effectively eliminate the threat. This protective function highlights the crucial role of the immune system in sustaining overall health and enabling the body to respond to an ever-changing environment of potential threats.