Haematopoiesis
（重定向自Blood formation）
![Diagram showing the development of different blood cells from haematopoietic stem cell to mature cells](/Images/godic/202501/01/Hematopoiesis_simple.svg2904.png")
_diagram2904.png")
![Sites of haematopoesis (human) in pre- and postnatal periods](/Images/godic/202501/01/Hematopoesis_EN.svg2904.png")
![Diagram including some of the important cytokines that determine which type of blood cell will be created.[13]
SCF= Stem Cell Factor
Tpo= Thrombopoietin
IL= Interleukin
GM-CSF= Granulocyte Macrophage-colony stimulating factor
Epo= Erythropoietin
M-CSF= Macrophage-colony stimulating factor
G-CSF= Granulocyte-colony stimulating factor
SDF-1= Stromal cell-derived factor-1
FLT-3 ligand= FMS-like tyrosine kinase 3 ligand
TNF-a = Tumour necrosis factor-alpha
TGFβ = Transforming growth factor beta
[14]](/Images/godic/202501/01/Hematopoietic_growth_factors2904.png")
Haematopoiesis (from Greek αἷμα, "blood" and ποιεῖν "to make"; also hematopoiesis in American English; sometimes also haemopoiesis or hemopoiesis) is the formation of blood cellular components. All cellular blood components are derived from haematopoietic stem cells. In a healthy adult person, approximately 10–10 new blood cells are produced daily in order to maintain steady state levels in the peripheral circulation.