Neutrophils that enter inflammatory sites can survive for days, but macrophages are very short lived and only survive for hours

The numbers of circulating neutrophils and macrophages greatly expand in numbers in response to an infection

Both neutrophils and macrophages contain abundant acidic cytoplasmic granules that can destroy ingested microbes or released to kill microbes too large to be ingested

Macrophages that enter inflammatory sites can survive for days, but neutrophils are very short lived and only survive for hours