Organs playing some role in digestion: the breaking down of food into smaller components that can be up-taken and used as source of energy or stucture.

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Does variation in human gut length vary predictably with diet of ancestors?

Background: Numerous online searches, textbooks and other sources seem to pin the average length of the human gut from mouth to anus (oroanal) between about 5-10m in length. To pick a reputable ...
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Is there any mechanical digestion that occurs once food/chyme enters the small intestine?

Does mechanical digestion occur in small intestines and, if so, how does it occur? I found some sources that say digestion happens mechanically and chemically in the small bowel, and others that say ...
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How is the appropriately-stratified gut microbiome acquired in organisms performing horizontal transmission?

I am studying horizontal transmission of primary symbionts in insect reproduction. This reminded me of an earlier question I had asked, in which I learned that humans analogously acquired their ...
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If chylomicrons can not get into the capillaries, how do they supply to tissues?

The transport of chylomicrons is into the lacteals mainly because they are too big to get into the capillaries and yet they later supply triglycerides in the extra hepatic tissue by traversing in the ...
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When you have your gallbladder removed, how does it affect bile flow into your small intestine?

Cholecystectomy, or removal of the gallbladder, is a common operation that is performed around the world. The gallbladder is typically viewed as a storage organ for bile produced by the liver. The ...
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human digestion: (spicy) food eaten at night is excreted next morning

I have noticed repeatedly, that if I eat spicy food late at night, it is excreted the next morning (after 8-10 hours). How is it possible that the digestion happened so fast? I would have expected ...
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Why does human waste still contain nutrients for plants?

The question is motivated by the Martian movie, in which the main character (Mark Watney) uses human waste to fertilize Martian soil and grow potatoes. Following the idea that energy can only ...