Ingesting Cholsterol

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MichaelXY
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Ingesting Cholsterol

Post by MichaelXY » Sun Apr 20, 2008 5:28 am

Okay, I realize cholesterol is a lipid, but I am unclear how it is managed in digestion. What I mean is, is the cholesterol impervious to all gastric juices? Does it just absorb into the duodenom? Is there any breakdown of the cholesterol before absorbtion into the bloodstream?
I looked all through my Campbells book, but very little is discussed on this particular molecule.

Thanks

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Post by MrMistery » Sun Apr 20, 2008 8:54 am

no, it is not broken down by any enzyme. It is simply absorbed in the small intestine as is.
If you want to study physiology, I recommend you purchase Boron. Campbell is good for introduction...
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MichaelXY
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Re: Ingesting Cholsterol

Post by MichaelXY » Sun Apr 20, 2008 9:50 pm

As always you have been a help. Thanks. Are you referring to this book?

http://www.amazon.com/Textbook-Medical- ... 0721632564

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Post by MrMistery » Mon Apr 21, 2008 8:37 pm

yeap. There are other physiology books out there. It matters less what you read, if you read one at all.
BTW, cholesterol is sometimes present in the diet esterified with fatty acids. If that is the case, the ester bond is first broken and then the cholesterol is absorbed.
"As a biologist, I firmly believe that when you're dead, you're dead. Except for what you live behind in history. That's the only afterlife" - J. Craig Venter

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Re: Ingesting Cholsterol

Post by dae » Sun May 04, 2008 8:31 pm

Cholesterol doesn't break down during digestion. After absorption, dietary cholesterol is picked up by chylomicrons and transported to the liver.

In case you're interested, in the liver, cholesterol has three possible fates: conversion into bile acids (used to emulsify dietary fats), which is the only route that cholesterol can exit the body; to serve as a precursor for steroid hormones, e.g. progesterone, testosterone, cortisol; or transport out of liver to be taken up by peripheral tissue and used in membranes (to regulate fluidity).

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Post by tittu » Tue May 13, 2008 1:41 am

You can also chk biochemistrybooks like Harper, Lehninger for thorough information. Harper is better for physiology related issues, because its for medical students ....

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