Leucocytes
Topic: Biology (জীববিদ্যা)
White blood cells, or leukocytes,
are cells of the immune system involved in
defending the body against both infectious
disease and foreign materials. Five different and
diverse types of leukocytes exist, but they are all
produced and derived from a multipotent cell in
the bone marrow known as a hematopoietic stem
cell. They live for about three to four days in the
average human body. Leukocytes are found
throughout the body, including the blood and
lymphatic system.
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