How old was the youngest mother in the world? Detailed answer

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How old was the youngest mother in the world? Detailed answer

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How old was the youngest mother in the world?

In 1939, 5-year-old Lina Medina from Peru gave birth to a boy by caesarean section. This is the earliest recorded case of childbirth in the history of modern medical observations.

Authors: Jimmy Wales, Larry Sanger

Random interesting fact from the Great Encyclopedia:

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.

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Learning new things, we forget the old 25.03.2016

A group of scientists from Germany, Spain and Italy showed in experiments on mice that in the process of memorizing new information in the brain, new connections between neurons are simultaneously formed and existing ones are weakened.

Working with mice, neuroscientists studied the hippocampus, the region of the brain responsible for the formation of memories. Information enters the hippocampus via three different pathways, and the connections between neurons are strengthened as memories are consolidated. By blocking the main "path", the scientists found that the mice were no longer capable of learning, to form conditioned reflexes. But if the information was already learned before such a blockage, then the memories remained.

But something else was more surprising. The researchers found that connections along this blocked "path" weakened - this could not be affected by the blockage itself. The source of this weakening was found: it turned out that this happened at the time of the formation of new ties.

"One explanation is that there is a limited amount of space in the brain, so when you're learning, you have to loosen some connections to make room for others. To learn new things, you have to forget things you've learned before," he said. study leader Cornelius Gross.

Scientists believe that their discovery may be, in particular, the key to understanding how people forget traumatic events.

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