3. Physiology
        3.6. Haematology
3.6.1. Blood cells

Blood cells

[Ref: WG21:p517-522; PK1:p235]

Bone marrow

In foetal life, blood cells are formed in liver (mainly) and spleen
* From 6 weeks to 7 months
* Peak at 5 months

From 6-7month in foetal life
--> Bone marrow becomes the main source of haemopoiesis

By age 18-20

RBC vs WBC

75% of the bone marrows belong to the white cell producing myeloid series

25% of the bone marrow are maturing red cells

NB:

Differentiation

Pluripotential stem cells
--> Progenitor cells (committed stem cells)
--> Blood cells

Separate pools of progenitor cells for

Stem cells also produce

Progenitor cells are produced under the influence of

 



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