The stomach is part of the digestive tract located between the esophagus and duodenum. The body forms a storage location which varies in size depending on the quantity of ingested food. By contractions of the stomach, food is kneaded and mixed with gastric juices. The resulting chyme (chymus) is to the end of the stomach is pushed, where the sphincter of the stomach port (pylorus) stimulates in small quantities to pass into the duodenum.

The gastric mucosa contains glands, which in 24 hours to about 2 liters gastric juices (enzymes) separate. These enzymes regulate the chemical breakdown of nutrients. The enzyme pepsin is responsible for the cleavage of proteins. Hydrochloric acid in the stomach activates pepsin and destroys a portion of the bacteria in the food.

The stomach has a capacity of 1 to 1.5 liters. The food continues to digest an average of 3 to 4 hours in the stomach.


Man Gay sapiens or a bipedal primate species in the family Hominidae. Research suggests that modern humans about 200,000 years ago in Africa emerged as a species. Humans have highly developed brains, which he is capable of abstract thinking, language, introspection, problem solving and emotion. Thanks to his intelligence and upright posture, allowing the arms to be free to pick up objects and manipulate, the man much more than other species able to use tools.