TY - CHAP M1 - Book, Section TI - Gastrointestinal Principles A1 - Zuckerman, Matthew D. A1 - Church, Richard J. A2 - Nelson, Lewis S. A2 - Howland, Mary Ann A2 - Lewin, Neal A. A2 - Smith, Silas W. A2 - Goldfrank, Lewis R. A2 - Hoffman, Robert S. Y1 - 2019 N1 - T2 - Goldfrank's Toxicologic Emergencies, 11e AB - Humans are in constant contact with xenobiotics. In addition to its critical role in absorbing nutrients, the gastrointestinal (GI) tract forms the initial functional barrier between ingested material and the body. An understanding of the structure, physiology, and innervation of the GI tract is critical to the toxicologic concepts of absorption, motility, and toxic insult. This chapter discusses the normal role of the GI tract and its relationship to toxicology. Anatomic, pathologic, and microbiologic principles are discussed, including the role of the GI tract in the metabolism of xenobiotics. Types of GI pathologies and their clinical manifestations are discussed, with examples when appropriate. SN - PB - McGraw-Hill Education CY - New York, NY Y2 - 2024/10/12 UR - accessemergencymedicine.mhmedical.com/content.aspx?aid=1163008263 ER -