My answer to What role does the immune system play in maintaining homeostasis?

Answer by Connie b. Dellobuono:

Fever, increased blood flow, wound healing and memory cells are ways the immune system maintains homeostasis. Macrophage precursors migrate into tissues in response to pathogens. Mature T cells travel through the circulatory system until they are activated by antigen-presenting cells (APCs), including B cells. When stimulated by APCs, the T cell recognizes the foreign antigen and is activated to complete its specific function. Memory B cells have long life span and can remember a pathogen and respond to it by creating cloned, short-lived plasma cells and activated B cells. Innate (first line of defense) and adaptive immunity (generates pathogen-specific immunologic response) work together to protect the body against pathogens.

What role does the immune system play in maintaining homeostasis?