NSCI 1403 Lecture Notes - Lecture 17: Constipation, Abdominal Wall, Portal Vein
27 Dec 2016
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Document Summary
The human digestive tract is a complete tube-within-a-tube system. Enzymes are secreted into the digestive tract by nearby glands which never contain food. Each part of the digestive system has a specific function. Food is never found within the accessory glands, only within the tract itself. The digestion of food in humans is an extracellular process. themselves. Digestion requires a cooperative effort by the production of hormones and the actions of the nervous system. Ulcers develop when the lining is exposed to digestive action; recent research indicates this is usually due to infection by helicobacter pylori bacteria. Stomach contents, a thick, soupy mixture, is called chyme. It is the semifluid mass of partly digested food that is expelled by the stomach into the duodenum and moves through the intestines during digestion. The small intestine: the human small intestine is a coiled muscular tube about three meters long.
