white blood cells

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White blood cells (WBC), also called leukocytes or leucocytes, are thecells of the immune system that are involved in protecting the body against both infectious disease and foreign invaders. All leukocytes are produced and derived from a multipotent cell in the bone marrow known as a hematopoietic stem cell. Leukocytes are found throughout the body, including the blood andlymphatic system. [1] Five different and diverse types of leukocytes exist. [2] These types are distinguished by their physical and functional characteristics. Monocytes andneutrophils are phagoc ytic. The number of leukocytes in the blood is often an indicator of disease. The normal white cell count is usually between 4 and 11 × 10 9 /L. In the US this is usually expressed as 4,000–11,000 white blood cells per microliter of blood. [3] They make up approximately 1%

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White blood cells(WBC), also calledleukocytesorleucocytes, are thecellsof theimmune systemthat are involved in protecting the body against bothinfectious diseaseand foreign invaders. All leukocytes are produced and derived from amultipotentcell in thebone marrowknown as ahematopoietic stem cell. Leukocytes are found throughout the body, including thebloodandlymphatic system.[1]Five different and diverse types of leukocytes exist.[2]These types are distinguished by their physical and functional characteristics.Monocytesandneutrophilsarephagocytic.The number of leukocytes in thebloodis often an indicator ofdisease. The normal white cell count is usually between 4 and 11 109/L. In the US this is usually expressed as 4,00011,000 white blood cells per microliter of blood.[3]They make up approximately 1%