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American Heritage Dictionary:
lac·te·al |
[From Latin lacteus, from lac, lact-, milk.]
lacteally lac'te·al·ly adv.|
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Oxford Dictionary of Sports Science & Medicine:
lacteal |
A central, blind-ended lymph vessel in a villus into which neutral fat is passed from the columnar epithelium of the small intestine where the fat has been resynthesized from fatty acids and glycerol. The fat is in the form of a white, milky emulsion (hence, the name lacteal) and is carried to all parts of the body.
Word Tutor:
lacteal |
The river was lacteal in nature because it had much glacial material in it.
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Oxford Dictionary of Biochemistry:
lacteal |
| lactation, lactate dehydrogenase, lactate | |
| lactic, lactic acid, lactic acidosis |
Saunders Veterinary Dictionary:
lacteal |
1. pertaining to milk.
2. any of the intestinal lymphatics that transport chyle.
Rhymes:
lacteal |
Wikipedia on Answers.com:
Lacteal |
| Lacteal | |
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| Transverse section of a villus, from the human intestine. X 350. a. Basement membrane, here somewhat shrunken away from the epithelium. b. Lacteal. c. Columnar epithelium. d. Its striated border. e. Goblet cells. f. Leucocytes in epithelium. f’. Leucocytes below epithelium. g. Bloodvessels. h. Muscle cells cut across. |
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| Villi of small intestine, showing bloodvessels and lymphatic vessels. |
A lacteal is a lymphatic capillary that absorbs dietary fats in the villi of the small intestine.
Triglycerides are emulsified by bile and hydrolyzed by the enzyme lipase, resulting in a mixture of fatty acids and monoglycerides.[1] These then pass from the intestinal lumen into the enterocyte, where they are re-esterified to form triacylglycerol. The triacylglycerol is then combined with phospholipids, cholesterol ester, and apolipoprotein B-48 to form chylomicrons. These chylomicrons then pass into the lacteals, forming a milky substance known as chyle. The lacteals merge to form larger lymphatic vessels that transport the chyle to the thoracic duct where it is emptied into the bloodstream at the subclavian vein.[2][3]
At this point, the fats are in the bloodstream in the form of chylomicrons. Once in the blood, chylomicrons are subject to delipidation by lipoprotein lipase. Eventually, enough lipid has been lost and additional apolipoproteins gained, that the resulting particle (now referred to as a chylomicron remnant) can be taken up by the liver. From the liver, the fat released from chylomicron remnants can be re-exported to the blood as the triglyceride component of very low density lipoprotein (VLDL). VLDL, also subject to delipidation by vascular lipoprotein lipase, delivers fats to tissues throughout the body and, in particular, the released fatty acids can be stored in adipose cells as triglycerides. As triglycerides are lost from VLDL the lipoprotein particle becomes smaller and denser (since protein is denser than lipid) and ultimately becomes low density lipoprotein (LDL). A lot has been written about LDL because it is thought to be atherogenic.
Note that in contrast to any other route of absorption from the small intestine, the lymphatic system avoids first pass metabolism.
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 | American Heritage Dictionary. The American Heritage® Dictionary of the English Language, Fourth Edition Copyright © 2007, 2000 by Houghton Mifflin Company. Updated in 2009. Published by Houghton Mifflin Company. All rights reserved. Read more |
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| Oxford Dictionary of Sports Science & Medicine. The Oxford Dictionary of Sports Science & Medicine. Copyright © Michael Kent 1998, 2006, 2007. All rights reserved. Read more |
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| Word Tutor. Copyright © 2004-present by eSpindle Learning, a 501(c) nonprofit organization. All rights reserved. eSpindle provides personalized spelling and vocabulary tutoring online; sign up free. Read more |
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Oxford Dictionary of Biochemistry. Oxford University Press. Oxford Dictionary of Biochemistry and Molecular Biology © 1997, 2000, 2006 All rights reserved. Read more | |
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| Saunders Veterinary Dictionary. Saunders Comprehensive Veterinary Dictionary 3rd Edition. Copyright © 2007 by D.C. Blood, V.P. Studdert and C.C. Gay, Elsevier. All rights reserved. Read more |
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Rhymes. Oxford University Press. © 2006, 2007 All rights reserved. Read more | |
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| Wikipedia on Answers.com. This article is licensed under the Creative Commons Attribution/Share-Alike License. It uses material from the Wikipedia article Lacteal. Read more |
