Which body system provides antibodies to combat infections?

The immune system is crucial for protecting the body against infections and diseases. It is specifically designed to identify and eliminate pathogens, such as bacteria, viruses, and fungi. One of the primary components of the immune system is the production of antibodies, which are specialized proteins created by B cells. Antibodies recognize and bind to specific antigens found on the surface of pathogens, marking them for destruction by other immune cells and neutralizing their effects.

The immune system operates through a complex network of cells, tissues, and organs, including lymph nodes, the spleen, and bone marrow. It has both innate and adaptive responses, with antibodies being a key feature of the adaptive immune response, which develops a targeted approach based on prior exposure to specific pathogens.

In contrast, the other body systems mentioned do not play a role in antibody production or combatting infections. The digestive system is primarily involved in breaking down food and absorbing nutrients. The nervous system is responsible for transmitting signals throughout the body and coordinating responses to stimuli. The excretory system functions to eliminate waste products from the body, such as urine, and does not have a direct role in the immune response.