Where is blood produced? Detailed answer

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Where is blood produced? Detailed answer

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Where is blood produced?

Red blood cells develop from so-called progenitor cells in the bone marrow of flat bones (ribs, sternum, pelvis, skull and spine). In the early stages of the formation of erythrocytes, they contain a cell nucleus. Gradually, hemoglobin accumulates in the cells. Before entering the bloodstream, the erythrocyte cell nucleus is destroyed. The period of maturation of erythrocytes from the moment the precursor cell appears to entering the blood is 4-5 days. The lifetime of an erythrocyte is on average 120 days.

Leukocytes differ depending on the presence or absence of special granules in their cytoplasm. Cells that do not contain granules (agranulocytes) are lymphocytes and monocytes. Monocytes are formed both in the bone marrow and in the spleen, and in the lymph nodes. Various groups of lymphocytes mature in the human bone marrow, and then migrate to other organs, where their formation is completed.

White blood cells with granules (granulocytes) are formed in the bone marrow from progenitor cells that give rise to stem cells, probably the same ones that give rise to erythrocyte progenitor cells.

Platelets are, in fact, fragments of the cytoplasm of very large cells (megakaryocytes) present in the bone marrow. Megakaryocytes are descendants of the same stem cells that give rise to erythrocytes and leukocytes. The life span of platelets is 8-10 days.

Author: Mendeleev V.A.

Random interesting fact from the Great Encyclopedia:

What is cloning?

In a narrow sense, cloning is the production of copies of cells, genes, antibodies and multicellular organisms in the laboratory. To do this, DNA is extracted from the original organism, a copy of which is desired to be obtained, and inserted into another egg. Further, this egg is implanted in the uterus of the future parent ("surrogate mother"), and as a result of a normal pregnancy, a copy of the original is born. An example of this is the world-famous Dolly the sheep.

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Maxim Integrated has released the new MAX77650 and MAX77651 PMIC (Power Management Integrated Circuit) multichannel power converters for portable and wearable electronics.

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input voltage range 2,7...5,5 V;
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