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There was a related podcast recently somewhere, the idea was that evolutionary lungs come from guts, so maybe guts would still have some ability to absorb oxygen, which, turns out, they indeed do. This could have some practical uses e.g. in intensive care situations where the patient's lung is useless (extreme COVID), which could give a last resort breathing opportunity while the lungs heal to a usable condition. Furthermore it gives a shitton of opportunity for butt jokes
Exactly how would carbon dioxide get exchanged if the lungs are damaged?
Well farts aren't just methane
If you can breathe through the butt as you can through your mouth, can you eat with your butt as well?
Was South Park right and you can put a turkey up your ass and digest it?
Legitimately, the colon, including the part immediately after the anus, is very capable of absorption of chemicals, there are some medicines other than suppositories that are sometimes given that way if needed. And the small amount of mucous it naturally produces through normal function is also capable of dissolving solid particulates for said absorption to work.
But(t), I don't think there would be any means for caloric intake to happen, even if the Turkey eventually was dissolved. I could very well be wrong though, I am talking out of my very own ass somewhat!
If you put it through a blender first. I believe you could