Most of our tissues contain a generous supply of macrophages, cells responsible for devouring particulate matter.
Don't expect to be able to distinguish macrophages most of the time.
Macrophages are easiest to see when they have devoured pigment, such as carbon.
A regrettable synonym for macrophage is "histiocyte". Better is "mononuclear phagocyte".
This is tissue from the chest of a smoker.
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Kansas City University of Medicine and Biosciences