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| 2023-09-22 09:41:35 | onclick： | How much do you know about cells in the body? |
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The researchers found that there are about 36 trillion cells in adult men, compared with 28 trillion cells in adult women.Surprisingly, small cells such as blood cells in the human body are about the same quality as large cells such as muscle cells, a finding that baffles researchers.On September 18, the results were published in the Proceedings of the National Academy of Sciences.
Ian Hatton and colleagues at the Max Planck Institute in Germany analyzed more than 1,500 scientific papers on how many cell types are in the body, how many cell types are in each tissue, and the average size and quality of each cell type.They found more than 400 known cell types in 60 different tissues.
Using data from the International Radiological Protection Commission, which compiled the quality of each tissue of an adult male weighing 70 kilograms, an adult woman weighing 60 kilograms and a child weighing 32 kilograms, the team estimated how many cells were in each tissue.
"The key is to look for papers describing the number of cells in different tissues.One of the team members, Eric Galbraith of McGill University in Canada, said, "Then understand that these tissues are made up of specific cells and what the size of these cells is.”
Researchers estimate that an adult woman has 28 trillion cells, a child has 17 trillion cells and an adult male has 36 trillion cells.Galbraith says the first two estimates are based on papers that mainly describe adult men, so the numbers are more uncertain."There is still more information about men than about women or children.' he said.
In addition to the number of cells, the team found that the total mass of each cell in the body appeared to be approximately equal."You might guess that there is an average cell size, and most of us are made up of this average cell size."Galbraith said, "but in fact, that's not the case.Very small cells and very large cells in our bodies, and in between, are about the same mass.”
"From a purely scientific point of view, it is interesting to quantify the diversity of human cells."When I teach students about cell biology and development, I say, 'We all start with a fertilized egg that undergoes a series of cell division and differentiation and eventually produces an adult organism with X cells.’”
"X has always been a tricky part."I'm glad my description of the number of cells is now at least in the correct order of magnitude, " he said.
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