Episode 137: The Digestive System
The Science of Everything Podcast
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The Different Organs of the GI Tract
There's a need to dissolve fats as well as carbohydrates and proteins. Fat is not soluble in water, so the body has to find a way of emulsifying it with molecules that allow them to be taken up by water. The liver does many other things, but we won't discuss all of its functions today. A final problem is that not everything can be digested, particularly there are plant substances such as cellulose that humans cannot digest. We need to extract water and if you are other things from it and then excreted. And that's the role of the large intestine, essentially, to deal with non-digestible material. It's sort of fairly logical as far
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