From 🍪 to 💩.
Where does all start?
When you eat something, let's say, a cookie, when introducing this amazingly delicious cooking masterpiece to your mouth, you first take a bite and start mechanical digestion with your teeth, which means, breaking down the food into smaller fragments by incising, tearing, and macerating it. As you do that, you put together the clusters of little moistening glands above and below your oral cavity you probably call lips to prevent the bits of cookie from falling out in addition to the liquid that rests in your mouth produced in three different glands adjacent to the mouth called saliva which contains enzymes that chemically break down the cookie fragments. How this works is by softening the small pieces by moistening them and turning them into a semi-fluid with help of salivary amylase that converts most glycogen into simple disaccharides.
(n.d.). Retrieved March 11, 2016, from https://www.mc.edu/faculty/files/8312/7861/0865/document1650.doc
Worcester, J. (1976). Physiological correspondences. Bryn Athyn, PA: Swedenborg Scientific Association.