Technically, the digestive system (i.e., the full gastro intestinal tract) is considered as part of the "outside" of the body, acting as an external surface similar to the skin. The space that an object can travel through without crossing a cell membrane or entering blood or tissue is called "lumen". So the same intuition as in the meme actually holds true here, too.
this post was submitted on 27 Dec 2025
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I like eating
Wait this is only one hole?
Yes it is a hole in one.
I will remove myself from the premises.
laughs in klein bottle
After it's flat it's ready to be made into a coffee cup
No, that's a punctured disk, you're thinking of a torus.
Edit: After dusting off my old-ass-hasn't-been-in-uni-for-10-years-brain, I've concluded the straw shown in the image is NOT a punctured disk, it's a closed annulus. It's still not a coffee mug and you're still thinking of a torus but I don't wanna go around spreading wrong math.