Granulocytes (polymorphonuclear leukocytes) are leukocytes characterized by the presence of differently staining granules in their cytoplasm when viewed under light microscopy. There are three types of granulocytes: neutrophils, basophils, and eosinophils.
Agranulocytes (mononuclear leucocytes) are leukocytes characterized by the apparent absence of granules in their cytoplasm. These cells include lymphocytes, monocytes, and macrophages.
Depending on the type of white blood cell have a different duration, as if neutrófilo has a shelf life of about three days, but if another type of leukocyte (white cell).