A Monogastric organism has only one stomach, and is the alternate gastric complex to a four-chambered stomach known as a ruminant. Examples of monogastric animals include horses, rabbits, humans, and pigs.

The Monogastric System

Starting with the mouth where food enters and is first broken down by mastication, moistening and lubrication of food prior to swallowing by saliva. As food is swallowed, it slides down the esophagus into the stomach. As the stomach contracts, the cardiac sphincter prevents backflow while secretion of HCl and other enzymes is mixed with food. In the small intestine, nutrients are absorbed and duodenal cells secrete hormones which stimulate release of bile and pancreatic enzymes. This is sent into the large intestine where water is absorbed. Finally in the anus and the rectum the feces are stored and eventually excreted.

Similarities between the Monogastric and Ruminant Systems

In both systems excess protein and amino acids are used as an energy source. Carnivorous, herbivorous, and omnivorous diets are common in both systems and there is no known correlation between gastointestinal systems and an organism's diet.