Intraepithelial lymphocytes are lymphocytes found in the epithelial layer of the gastrointestinal tract. They are components of gut-associated lymphoid tissue (GALT). A scanning electron microscope (SEM) image of a single human lymphocyte. ... Types of epithelium This article discusses the epithelium as it relates to animal anatomy. ... The gastrointestinal tract (GI tract), also called the digestive tract, alimentary canal, or gut, is the system of organs within multicellular animals that takes in food, digests it to extract energy and nutrients, and expels the remaining waste. ... Overview About 70% of the bodys immune system is found in the digestive tract. ...

This digestive system article is a stub. You can help Wikipedia by expanding it.