Editing Stomach (section)

=== Absorption ===
Although the absorption in the human digestive system is mainly a function of the small intestine, some absorption of certain small molecules nevertheless does occur in the stomach through its lining. This includes:
* Water, if the body is [[Dehydration|dehydrated]]
* Medication, such as [[aspirin]]
* [[Amino acids]]<ref>{{Cite book|title = Amino Acids in Animal Nutrition|edition = 2nd|editor-first = J.P.F.|editor-last = D'Mello|chapter = Absorption of Amino acids and Peptides|last1 = Krehbiel|first1 = C.R.|chapter-url = http://www.fcav.unesp.br/Home/departamentos/zootecnia/lucianohauschild/085199654x_chap03.pdf|first2 = J.C.|last2 = Matthews|pages = 41–70|access-date = 2015-04-25|archive-date = 2015-07-15|archive-url = https://web.archive.org/web/20150715082016/http://www.fcav.unesp.br/Home/departamentos/zootecnia/lucianohauschild/085199654x_chap03.pdf|url-status = dead}}</ref>
* 10–20% of ingested [[ethanol]] (e.g. from alcoholic beverages)<ref name=intox>{{cite web|title=Alcohol and the Human Body|url=http://www.intox.com/t-physiology.aspx|publisher=Intoximeters, Inc.|access-date=30 July 2012}}</ref>
* [[Caffeine]]<ref>{{Cite book|title = Coffee and Health|last = Debry|first = Gérard|publisher = John Libbey Eurotext|year = 1994|isbn = 9782742000371|location = Montrouge|url = https://books.google.com/books?id=uZaaCk-8s9sC&pg=PA129|access-date = 2015-04-26|format = PDF (eBook)|page = 129}}</ref>
* To a small extent water-soluble [[vitamin]]s (most are absorbed in the small intestine)<!-- See page 419--><ref>{{Cite book|title = Nutritional Sciences: From Fundamentals to Food|last1=McGuire|first1=Michelle|last2=Beerman|first2=Kathy|publisher=Cengage Learning|edition=3|url = https://books.google.com/books?id=bYAJAAAAQBAJ|isbn=978-1133707387|date=2012-01-01|page=419}}</ref>

The [[parietal cell]]s of the human stomach are responsible for producing [[intrinsic factor]], which is necessary for the absorption of [[vitamin B12]]. B12 is used in cellular metabolism and is necessary for the production of [[red blood cell]]s, and the functioning of the [[nervous system]].