RT Book, Section
A1 Hasler, William L.
A1 Owyang, Chung
A2 Kasper, Dennis
A2 Fauci, Anthony
A2 Hauser, Stephen
A2 Longo, Dan
A2 Jameson, J. Larry
A2 Loscalzo, Joseph
SR Print(0)
ID 1120810257
T1 Approach to the Patient with Gastrointestinal Disease
T2 Harrison's Principles of Internal Medicine, 19e
YR 2014
FD 2014
PB McGraw-Hill Education
PP New York, NY
SN 9780071802154
LK accessmedicine.mhmedical.com/content.aspx?aid=1120810257
RD 2021/04/15
AB The  gastrointestinal  (GI)  tract  extends  from  the  mouth  to  the  anus  and  is  composed  of  several  organs  with  distinct  functions.  Specialized  independently  controlled  thickened  sphincters  that  assist  in  gut  compartmentalization  separate  the  organs.  The  gut  wall  is  organized  into  well-defined  layers  that  contribute  to  functional  activities  in  each  region.  The  mucosa  is  a  barrier  to  luminal  contents  or  a  site  for  transfer  of  fluids  or  nutrients.  Gut  smooth  muscle  in  association  with  the  enteric  nervous  system  mediates  propulsion  from  one  region  to  the  next.  Many  GI  organs  possess  a  serosal  layer  that  provides  a  supportive  foundation  but  that  also  permits  external  input.