The Digestive System essays

The Digestive System essays Wanna come on a journey through the human digestive system? Join me, Pizza, and Ill tell you everything you need to know about the human digestive system. First, we enter through the mouth. The teeth will tear and grind up the food. The tongue will move the food around then the saliva start to chemically digest the food turning it into a watery mixture that can easily pass into the stomach. Then the food goes down the throat, which is a tube, connecting the mouth to the esophagus, which links also to the stomach. The food is carried along the esophagus by muscular contractions called peristalsis. The food is stores and digested in the stomach, the stomach contains hydrochloric acid and other important enzymes, which chemically break down the food, releasing the nutrients. Muscular contractions move the partially digested food around the stomach. Nutrients are absorbed in the small intestine. The small intestine is divided into three sections. It continues to break down the food and r elease the nutrients into the bloodstream so the can be passed around the body. It has a very large surface due to the villi along its walls that help absorption. Then the liver processes and distributes nutrients. The liver creates bile that is important in chemically breaking down the food in the small intestine. It also processes damaged red blood cells and stores vitamins A and D. When there is no food in the small intestine bile from the liver is sent to the gall bladder where it is stored in a concentrated form to be released when food enters the digestive tract. The pancreas produces pancreatic juice. The pancreas makes enzymes that are released into the small intestine to br4eak down the food. It neutralizes the hydrochloric acid from the stomach, makes the enzyme to stimulate the liver into producing bile and secretes insulin that transports sugar. Feces are stored and expelled by the large intestine. Bacteria in the large intestine act on th...