Digestive System

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.

And then?

After swallowing the shattered cookie bolus with your tongue muscle and some help of the body's natural lubricant, mucus, as a natural reflex the broken down bits of food are pushed down the larynx to the (o)esophagus, a fibromuscular tube, where peristaltic contractions cause mechanical digestion and more mucus lubricates this ball of food to make the stomach safe from receiving any damage from any pointy edges. Next, the bolus enters the stomach through the cardiac sphincter, a valve that maintains acid in the stomach.

The Stomach

Once the bolus of super delicious cookie enters the stomach, gastric enzymes, secreted by chief cells in the inner lining of the stomach, combine with mucus from the mucous cells in the stomach inner lining and hydrochloric acid to form gastric juices. The gastric juices contain an enzyme called pepsin that digests dietary proteins. Once the super mega delicious cookie bolus has become semiliquid chyme of crushed cookie bits and gastric juices, it travels through another valve called the pyloric sphincter leading into the duodenum of the small intestine.

The Intestines

As soon as the cookie chyme enters the duodenum, the pancreas releases bile stored in the gallbladder and enzymes such as pancreatic amylase, whose function is to split starch and glycogen into disaccharides.

Bibliography

(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.