Final answer:
Macrophages are crucial immune cells that combat infection by engulfing pathogens and producing cytokines that help coordinate the immune response against invaders.
Step-by-step explanation:
Macrophages will combat infection. These cells are an essential component of the immune system and are responsible for phagocytizing pathogens and clearing infections. Not only do macrophages ingest and destroy invading organisms, but they also release cytokines which are vital in recruiting other cells of the immune system to the site of infection to help in the defense. These cells differentiate from monocytes, a type of white blood cell circulating in the blood, and can either roam freely or be fixed in tissue. Macrophages are uniquely equipped to both engulf invaders directly and facilitate broader immune responses by influencing other immune cells.