http://en.wikipedia.org/wiki/Digestion
http://www.whfoods.com/genpage.php?tname=faq&dbid=16
http://www.niddk.nih.gov/health-information/health-topics/Anatomy/your-d...
http://bk.psu.edu/clt/bisc4/ipweb/misc/assignmentfiles/digestive/Digesti...
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