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Originally Posted by geokker
I think the reasoning is that the GIT is continous with the outside of the body. So, if the GIT is inside the body, where would the heart be? The 'inner inside'?
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Huh? The heart's not in the GI tract, it's surrounded by the pericardial cavity, which is in the mediastinum. I don't get what you're trying to say there.
Regardless, the fact remains that after I've ingested food and it's reached, say, my duodenum, it (the chyme)
is inside of me, not outside of me. It is 100%, fully enclosed by my body. There is no path for a hand or medical device to travel from the outside of my body to that mostly digested food that does not pass through my skin and other tissues, or require me opening my mouth (or the other end). It's like Prego ... It's in there.
Here's the deal. The average person says, and accepts, that ingested food is inside his/her body. Some biologists like to get technical and say that it's not: I guess they think this 'amazing' fact makes them look smarter. Well, they're wrong: technically, food in the GI tract IS inside of the body.
