The guts of vertebrates are well supplied with blood vessels, to enable them to absorb digested food. But this means they can also, in principle, absorb oxygen and breathing through the bottoms is not well known among fish as compared to using the gills to breathe. Dr. Takabe research has it that mice, rats and pigs into bottom breathers If they can extend the trick to people, it could offer an alternative to tracheal intubation as a means of keeping those with breathing difficulties alive. How is anal breathe possible on humans ?

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