How is blood made?

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How is blood made

Blood is made every day by our body at a breakneck pace of several billion cells per day. Blood cells and plasma have different origins.

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The bone marrow is responsible for the regeneration of the formed elements of the bloodthat is to say blood cells (blood cells): this is hematopoiesis.

Blood: blood cells come from the bone marrow

In the bloodthe white blood cellsred blood cells and pads are all synthesized from the same hematopoietic stem cells, but differentiation enabled by different hormone varies:

  • leukopoiesis gives rise to leukocytes (white blood cells): macrophagesthe lymphocytesor granulocytes;
  • erythropoiesis allows the maturation of red blood cells (red blood cells), including the loss of the cell nucleus;
  • thrombopoiesis allows the synthesis of blood platelets, larger cell fragments, megakaryocytes.

Blood cells are made during hematopoiesis from the bone marrow. Here, from left to right: a red blood cell, a platelet and a white blood cell. © DR

Plasma: plasma proteins

the plasma is composed of 90% water, and contains proteins plasma synthesized by different organs:

  • I’albumin is synthesized by liver ;
  • the fibrinogen is made by the liver and megakaryocytes;
  • the antibody are synthesized by immune cells.

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