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Gastrey

Gastrey (gastrea; Greek gastre – camber) – the certain hypothetical ancestral two-layer form of metazoans (according to Gekkel's theory) forming by means of emboly (invagination) of a vegetative hemisphere of a blastea in animalny; in development of modern animals it rekapitulirutsya (repeats) in a gastrula stage.

 
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The weight of a human brain makes about 2% of all body weight, however it consumes about 20% of the oxygen coming to blood. This fact does a human brain extremely susceptible to the damages caused by shortage of oxygen.