Question: which type of blood cell becomes a macrophage
Answer: Macrophages ( Greek : big eaters , from Greek μακρός ( makrós ) = large , φαγείν ( phageín ) = to eat ) are a type of white blood cell , of the immune system , that engulfs and digests cellular debris , foreign substances , microbes , cancer cells , and anything else that does not have the type of proteins specific to healthy body cells on its surface in a process called phagocytosis .