What is the primary function of the immune system?

The primary function of the immune system is to defend against infections. This system comprises a complex network of cells, tissues, and organs that work together to identify and eliminate pathogens such as bacteria, viruses, fungi, and parasites. The immune response includes various mechanisms, like the activation of white blood cells, production of antibodies, and the generation of memory cells that enable the body to respond more effectively to future infections.

The immune system plays a crucial role in protecting the body from disease. When pathogens enter the body, immune cells recognize them as foreign and initiate a response. This includes inflammation to contain the infection and the recruitment of specialized cells that target and destroy the pathogens. In addition, the immune system can "remember" previous infections, allowing for a quicker and more efficient response if the same pathogen is encountered again.

Other functions mentioned, such as regulating blood pressure, producing hormones, or supporting digestion, are attributed to different systems in the body, such as the cardiovascular, endocrine, and digestive systems, respectively. These systems do not primarily focus on defending the body from infectious agents, highlighting the unique and critical role of the immune system in maintaining health and preventing disease.