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This seems overly reductionist to the point where I could just as easily describe my mouth and my anus as the same hole.
It's perfectly reductionist. You have defined our biology in exactly the same way medical texts do.
Yeah, that's a concept that gets covered extensively in anatomy, immunology, and microbiology. It's called "the donut model". This is not a joke. It clearly shows how your digestive system is exposed to the outside world, similar to skin. You can obviously see why this is important immunologically, since germs can just get into the mouth/butthole in a way that they can't penetrate skin.
It's one long hole.
Yes. It's called the gastrointestinal tract.
Now you're getting it!
Because they are the same hole. Welcome to topology
that is actually the case. there is an unimpeded path from your mouth to your anus