Which of the following is a function of the Immune System?

The immune system plays a critical role in the body by providing protection from diseases. This system includes a complex network of cells, tissues, and organs that work together to defend the body against pathogens such as bacteria, viruses, fungi, and parasites. When the body detects harmful invaders, the immune system activates various defense mechanisms, including the production of antibodies, activation of white blood cells, and the release of signaling molecules that help coordinate the immune response.

The effectiveness of the immune system is vital for maintaining overall health, as it helps to identify and eliminate threats before they can cause significant harm. This protective function is crucial for both preventing infections and managing diseases, making it a central aspect of the body's defense strategy. The immune system's ability to distinguish between self and non-self is also important for preventing autoimmune diseases, where the immune system mistakenly attacks the body’s own tissues.

In contrast, hormonal regulation, fluid balance, and nutrient absorption are functions served by different systems in the body. Hormonal regulation is primarily managed by the endocrine system, fluid balance is controlled largely by the renal system, and nutrient absorption largely occurs in the digestive system. Each of these systems has distinct roles that do not overlap with the protective function of the immune system.