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  2. Haematopoiesis - Wikipedia

    en.wikipedia.org/wiki/Haematopoiesis

    Diagram showing the development of different blood cells from haematopoietic stem cell to mature cells. Haematopoiesis (/ h ɪ ˌ m æ t ə p ɔɪ ˈ iː s ɪ s, ˌ h iː m ə t oʊ-, ˌ h ɛ m ə-/; [1] [2] from Ancient Greek αἷμα (haîma) 'blood' and ποιεῖν (poieîn) 'to make'; also hematopoiesis in American English, sometimes h(a)emopoiesis) is the formation of blood cellular ...

  3. Haematopoietic system - Wikipedia

    en.wikipedia.org/wiki/Haematopoietic_system

    When bone marrow develops, it eventually assumes the task of forming most of the blood cells for the entire organism. [3] However, maturation, activation, and some proliferation of lymphoid cells occurs in the spleen, thymus, and lymph nodes. In children, haematopoiesis occurs in the marrow of the long bones such as the femur and tibia.

  4. Hematopoietic stem cell - Wikipedia

    en.wikipedia.org/wiki/Hematopoietic_stem_cell

    Hematopoietic stem cells (HSCs) are the stem cells [1] that give rise to other blood cells.This process is called haematopoiesis. [2] In vertebrates, the first definitive HSCs arise from the ventral endothelial wall of the embryonic aorta within the (midgestational) aorta-gonad-mesonephros region, through a process known as endothelial-to-hematopoietic transition.

  5. Bone marrow - Wikipedia

    en.wikipedia.org/wiki/Bone_marrow

    Bone marrow is a center of a variety of immune activities: i) hematopoiesis, ii) osteogenesis, iii) immune responses, iv) distinction between self and non-self antigens, v) central immune regulatory function, vi) storage of memory cells, vii) immune surveillance of the central nervous system, viii) adaptation to energy crisis, ix) provision of ...

  6. Hematopoietic stem cell niche - Wikipedia

    en.wikipedia.org/wiki/Hematopoietic_stem_cell_niche

    There are 2 types of hematopoiesis that occur in humans: Primitive hematopoiesis – blood stem cells differentiate into only a few specialized blood lineages (typically isolated to early fetal development). Definitive hematopoiesis – multipotent HSCs appear (occurs through the majority of human lifetime).

  7. Extramedullary hematopoiesis - Wikipedia

    en.wikipedia.org/wiki/Extramedullary_hematopoiesis

    In adults, the majority of hematopoiesis occurs in the bone marrow. Significant production in any other organ is usually the result of a pathological process. When red blood cell (RBC) numbers are low, the body induces a homeostatic mechanism aimed to increase the synthesis of RBCs, typically via the production of erythropoietin. If the loss of ...

  8. Myeloid tissue - Wikipedia

    en.wikipedia.org/wiki/Myeloid_tissue

    In hematopoiesis, myeloid cells, or myelogenous cells are blood cells that arise from a progenitor cell for granulocytes, monocytes, erythrocytes, or platelets [1] [2] (the common myeloid progenitor, that is, CMP or CFU-GEMM), or in a narrower sense also often used, specifically from the lineage of the myeloblast (the myelocytes, monocytes, and ...

  9. Blood - Wikipedia

    en.wikipedia.org/wiki/Blood

    The combined surface area of all red blood cells of the human body would be roughly 2,000 times as great as the body's exterior surface. [ 14 ] 4,000–11,000 leukocytes : [ 15 ] White blood cells are part of the body's immune system ; they destroy and remove old or aberrant cells and cellular debris, as well as attack infectious agents ...