Definitions for lactealˈlæk ti əl
This page provides all possible meanings and translations of the word lacteal
any of the lymphatic vessels that convey chyle from the small intestine to the thoracic duct
relating to or consisting of or producing or resembling milk
"lacteal fluids"; "lacteal organs"
Lactiferous ducts or other components of milk-producing organs.
Relating to milk.
Relating to milk production.
..lacteal ducts in the breasts...
pertaining to, or resembling, milk; milky; as, the lacteal fluid
pertaining to, or containing, chyle; as, the lacteal vessels
one of the lymphatic vessels which convey chyle from the small intestine through the mesenteric glands to the thoracic duct; a chyliferous vessel
Origin: [L. lacteus milky, fr. lac, lactis, milk. Cf. Galaxy, Lettuce.]
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. 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. 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 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, 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 and ultimately becomes low density lipoprotein. A great deal has been written about LDL because it is thought to be atherogenic.
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