White Blood Cell Production: Where & How They're Made
White blood cells (leukocytes) are produced in red bone marrow via hematopoiesis. Key steps:
- Hematopoietic stem cells (HSCs) in marrow differentiate into myeloid (CMPs) and lymphoid (CLPs) progenitors.
- Myeloid line: monocytes, neutrophils, eosinophils, basophils.
- Lymphoid line: lymphocytes (B, T, NK cells).
- Maturation: Progenitors divide, acquire specialized functions.
- Release: Mature cells enter bloodstream for immune surveillance.
- Regulation: Hormones, cytokines, growth factors adjust production to body's needs.
Marrow sites: hip bones, ribs, sternum, vertebrae.
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