White blood cells

 White Blood Cells (leucocytes) are all of  the cells in the blood which, unlike Red Blood Cells, do not contain hemoglobin. They make up about 1% of blood and have an average life time of 4 days.They are formed from heamatopoetic (multipotent) stem cells in the bone marrow. From there the white blood cells migrate into the tissues in response to chemokines to take place in theimmune response.

Types of White Blood Cell

{| width="400" border="1" cellpadding="1" cellspacing="1" summary="The three main types of bood cell are Granulocytes(neutrophils, eosinophils, basophils), Monocytes, and Lymphocytes" |- ! scope="col"

| Name ! scope="col" |  %of total number of WBCs ! scope="col" | Function |-

| Lymphocyte | 30 | B lymphocytes make antibodies.T lymphocytes target cells infected by viruses |-

| Monocyte | 5 | Form macrophages for phagocytosis. |- | Neutrophil | 60 | phagocitosis |-

| Eosinophil | 2.5 | Target paracites  |- | Basophil | 2.5 | Secrete histamine |}