Thousands of villi project into the lumen of the small intestine per square inch of mucosal surface. Within each villus are capillaries and a lymphatic vessel. Much of the absorption occurs by active transport, mainly sodium-dependent co-transport. Nutrients transported into the capillaries pass to the hepatic portal vein on the way to the liver. Triglycerides are broken down in the intestine and pass through the intestinal wall, coated with phosphoproteins, to form chylomicrons, then passed into the lymphatic vessels, which are called lacteals.

The WikiPremed MCAT Course is a comprehensive course in the undergraduate level general sciences. Undergraduate level physics, chemistry, organic chemistry and biology are presented by this course as a unified whole within a spiraling curriculum. Please read our policies on Privacy and Shipping & Returns.  Contact Us. MCAT is a registered trademark of the Association of American Medical Colleges, which does not endorse the WikiPremed Course. WikiPremed offers the customers of our publications or our teaching services no guarantees regarding eventual performance on the MCAT.

Creative Commons License
WikiPremed is a trademark of Wisebridge Learning Systems LLC. The work of WikiPremed is published under a Creative Commons Attribution NonCommercial ShareAlike License. There are elements of work here, such as a subset of the images in the archive from WikiPedia, that originated as GNU General Public License works, so take care to follow the unique stipulations of that license in printed reproductions.