Abomasum is the chamber which is called the true stomach in a ruminant's stomach. This is because the digestion of food takes place in this chamber with the help of gastric juices secreted by the walls of the abomasum. This is similar to the digestion that takes place in the human stomach. The digestion gets completed by the action of enzymes, and the digested food is passed into the small intestine where the absorption of nutrients takes place.