| Steven's Herbaweb News ● Volume 1 Number 3 | |||||||||||||||||||||
WelcomeThe Small IntestineKrebs cycleFeatured Product |
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| more stem cells , | ||
| cells
that migrate up the surface of the villus while differentiating into
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| All
of which replace older cells that continuously die by apoptosis. |
The villi increase the surface area of the small intestine to many times what it would be if it were simply a tube with smooth walls. In addition, the apical (exposed) surface of the epithelial cells of each villus is covered with microvilli (also known as a "brush border"). Thanks largely to these, the total surface area of the intestine is almost 200 square meters, about the size of the singles area of a tennis court and some 100 times the surface area of the exterior of the body.
The electron micrograph (courtesy of Dr. Sam L. Clark) shows the microvilli of a mouse intestinal cell.
Incorporated in the plasma membrane of the microvilli are a number of enzymes that complete digestion:
| aminopeptidases
attack the
amino terminal (N-terminal) of peptides producing amino acids. |
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disaccharidasesThese
enzymes convert disaccharides into their monosaccharide subunits.
Fructose simply diffuses into the villi, but both glucose and galactose are absorbed by active transport. |
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| fatty acids and monoglycerides. These become resynthesized into fats as they enter the cells of the villus. The resulting small droplets of fat are then discharged by exocytosis into the lymph vessels, called lacteals, draining the villi. |
As we've been told, you can see that there are these villi, like little fingers. And those villi are responsible for absorbing nutrition from the food we eat. That's really what all of the above boils down to.
And since the villi increase the effective surface area available for absorption, it's pretty clear that if they're all clogged up they're not doing a good job.
If you've read the fact sheets about Formula 3, you've seen that it also contains "Essential micronutrients to support the Krebs Cycle and enhance cellular energy production." Needless to say, I wondered what the "Krebs Cycle" is and why I care. Here's a short description and a good pointer:
The citric acid cycle (also called the Krebs cycle, after its primary discoverer, Sir Hans Krebs) is a central part of the chemistry which converts food components like carbohydrates, fats, andd proteins into ATP and thus provides energy to carry out biological functions.
Wow! Okay - I'm not sure I get all of that. I think it says that the Krebs cycle is a significant mechanism by which we turn fuel into energy. Certainly sounds like something I'd want to have working correctly, eh?
Here's the link: