Illustration depicting each type of cell that can be found in the blood: erythrocytes (red blood cells), leukocytes (white blood cells), and platelets (activated and non-activated).

It specifically showcases each variety of white blood cells that occurs and their relative size to the red blood cells. The colors of the individual white blood cells, the Neutrophil, Eosinophil, Basophil, Monocyte, and Lymphocyte, are based on what color they would appear when stained under a microscope.