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The immune system plays a vital role in protecting the body from diseases and infections. Its primary function is to identify and eliminate pathogens such as viruses, bacteria, fungi, and toxins that can harm the body. This complex network of cells, tissues, and organs works together to recognize foreign invaders and trigger appropriate immune responses, which can involve various types of cells, including white blood cells, antibodies, and other components that target and destroy these threats.

While other systems, such as those responsible for regulating body temperature, nutrient absorption, and hormonal balance, have distinct functions that are essential for overall health, they do not serve the primary purpose of defending the body against pathogens. The immune system is uniquely focused on surveillance and protection against disease, making its effectiveness critical for maintaining the health and well-being of an organism.