It is about a structure yhat is made of veins y arteries, which one the blood pass, this liquid es most important to keep alive the organism, because the nutrients of the food pass too and the oxigen that pass trought the air.
those sustances goes to the cells where the chemical reactions tyhet gave energgy to keep they alive
links:
https://gacetamedica.com/investigacion/por-que-la-covid-19-afecta-solo-a-algunos-organos-y-no-a-otros/
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