A grasp of psychology is also important in designing a good game; you want to know how players will feel at every point in the game. And it is vitally important that you can explain rules clearly in plain English.
The stomach's main function is digestion. It does this by: The stomach uses pepsin (enzyme) and peptidase (another enzyme) to break down proteins in your food. The acid released by the stomach doesn't break down food it only provides a good environment for the enzymes to work in.
The stomach is a muscular, hollow, dilated part of the gastrointestinal tract that functions as a vital digestive organ. The stomach is present in humans and many other animals, including several invertebrates (e.g., echinoderms, insects, and molluscs).