TABLE COMPARISON BETWEEN RED BLOOD CELLS, WHITE BLOOD CELLS AND PLATELETS

Feature	Red Blood Cells	White Blood Cells	Platelets
Name	Erythrocytes	Leucocytes	Thrombocytes
Color	Red	Colorless	Colorless
Formation	Liver and spleen (embryonic life), red bone marrow of sternum, ribs, vertebrae (adult life)	Red bone marrow and lymphatic system	Red bone marrow
Size	6-8 μm	Larger than Red Blood Cells, 12 to 15 µm	Smaller than Red Blood Cells
Shape	Biconcave	Different	Plate like
Number per mm3 of Blood	5-5.5 million (male), 4-4.5 million (female)	7000-8000	250,000
Structure	Elastic cell membrane, no nucleus	Have Nucleus	No nucleus, membrane bounded, Cytoplasmic fragments of cells
Life Span	4 months (120 days)	Variable	The average life span of circulating platelets is 8 to 9 days. Transfused platelets have 3-4 days of life span.
Function	Transport of Gases	Immunity	Blood Clotting