Which system in the body is primarily responsible for fighting infections?

The immune system is primarily responsible for fighting infections in the body. It comprises a network of cells, tissues, and organs that work together to defend against pathogens such as bacteria, viruses, and other foreign invaders. This system includes various components, such as white blood cells, antibodies, and the lymphatic system, which detect and eliminate harmful agents.

When an infection occurs, the immune system kicks into action, triggering responses that can involve inflammation, the production of antibodies, and the activation of specialized immune cells to target and destroy the pathogens. This capability is crucial for maintaining health and preventing diseases.

In contrast, the nervous system focuses on transmitting signals throughout the body, coordinating responses, and processing sensory information. The digestive system is responsible for breaking down food and absorbing nutrients essential for energy and growth. The endocrine system produces hormones that regulate various bodily functions, including metabolism and mood, but does not directly engage in fighting infections. Understanding these distinctions highlights the unique role of the immune system in protecting the body from disease.