Chylomicrons are large lipoprotein particles (having a diameter of 75 to 1,200nm) that are created by the absorptive cells of the small intestine.The chylomicrons are released by exocytosis from enterocytes into lacteals, lymphatic vessels originating in the villi of the small intestine, and are then secreted into the bloodstream at the thoracic duct's connection with the left subclavian vein. Chylomicrons transport exogenous lipids to liver, adipose, cardiac and skeletal muscle tissue where they are broken down by lipoprotein lipase into very low density lipoproteins (VLDLs). A lipoprotein is a biochemical assembly that contains both proteins and lipids. ... A nanometre (American spelling: nanometer) is 1. ... In anatomy, the intestine is the segment of the alimentary canal extending from the stomach to the anus and, in humans and other mammals, consists of two segments, the small intestine and the large intestine. ... Neuron A (transmitting) to neuron B (receiving) 1. ... Enterocyte is a type of epithelial cell of the superficial layer of the small and large intestine tissue. ... A lacteal is a lymphatic capillary that absorbs dietary fats in the villi of the small intestine. ... In anatomy, lymph vessels are thin walled, valved structures that carry lymph away from the tissues, through the lymph nodes and thoracic duct back to the general circulation. ... Red blood cells (erythrocytes) are present in the blood and help carry oxygen to the rest of the cells in the body Blood is a circulating tissue composed of fluid plasma and cells (red blood cells, white blood cells, platelets). ... In human anatomy, the thoracic duct is an important part of the lymphatic system — it is the largest lymphatic vessel in the body. ... The subclavian vein is a continuation of the axillary vein and runs from the outer border of the first rib to the medial border of anterior scalene muscle. ... Some common lipids. ... Adipose tissue is an anatomical term for loose connective tissue composed of energy in the form of fat, although it also cushions and insulates the body. ... Lipoprotein lipase (EC 3. ... Very Low Density Lipoprotein (VLDL) is a lipoprotein subclass. ...

Contents when released

Nascent chylomicrons are primarily composed of triglycerides (85%) and contain some cholesterol and cholesteryl esters. The main apolipoprotein component is apolipoprotein B-48 (APOB48). Triglyceride (blue: fatty acid; red: glycerol backbone) Triglycerides are glycerides in which the glycerol is esterified with three fatty acids. ... Cholesterol is a sterol (a combination steroid and alcohol). ... To meet Wikipedias quality standards, this article or section may require cleanup. ... Apolipoprotein B (APOB) is the primary apolipoprotein of low density lipoproteins (LDL or bad cholesterol), and is responsible for carrying cholesterol to tissues. ...

Changes during circulation

While circulating in lymph and blood, chylomicron exchanges components with High Density Lipoproteins (HDL). The HDL donates apolipoprotein C-II (APOC2) and apolipoprotein E (APOE) to the nascent chylomicron and thus matures it into a "chylomicron." APOC2 is the cofactor for lipoprotein lipase (LPL) activity. Once triglyceride stores are distributed, the chylomicron returns APOC2 (but keeps APOE) back to the HDL and thus becomes a chylomicron remnant. APOB48 and APOE are important to identify the chylomicron remnant in the liver for endocytosis and breakdown. HDL is an initialism that may refer to any of the following: High density lipoprotein Hardware description language german: Hab Dich Lieb This page concerning a three-letter acronym or abbreviation is a disambiguation page — a navigational aid which lists other pages that might otherwise share the same title. ... HDL is an initialism that may refer to any of the following: High density lipoprotein Hardware description language german: Hab Dich Lieb This page concerning a three-letter acronym or abbreviation is a disambiguation page — a navigational aid which lists other pages that might otherwise share the same title. ... Apolipoprotein C2 is a lipoprotein responsible for the activation of low density lipoprotein (LDL) in capillaries and thus begins the catabolism of the chylomicrons/VLDL. Categories: | ... Apolipoprotein E (APOE), a main apoprotein of the chylomicron, binds to a specific receptor on liver cells and peripheral cells. ... Lipoprotein lipase (EC 3. ... High-density lipoproteins (HDL) form a class of lipoproteins, varying somewhat in their size (8–11 nm in diameter), that carry cholesterol from the bodys tissues to the liver. ...