are projections of the apical(free) membrane of the absorptive cells. Each projection contains a bundle of actin filaments. When viewed under a microscope they form a fuzy line called the brush border
a clear yellow fluid that contains water and mucous and is slightly alkaline. Together with pancreatic juices they provide a liquid medium that aids the absorption of substances from chyme.
brush border enzymes
digestive enzymes synthesized by the absorptive cells. They insert themselves in the plasma membrane of microvilli. Thus some enzymatic digestion occurs at the surface of absorptive cells
localized mixing contractions that occur in portions of intestine distended by a large volume of chyme. They mix chyme with the digestive juices and bring the particles of food into contact with the mucosa for absorption. They do not push food along the tract
migrating motility complex
the type of peristalsis that occurs in the small intestine. Takes 90-120 minutes for one to move from the stomach to the ilieum