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digetive system essay

            The digestive system is a group of organs that perform the process by which food,.
             containing nutrients, is eaten and broken down into different components. This breakdown.
             makes it possible for the digested material to pass through the intestinal wall into the.
             blood stream. The digestive process contains many different steps that take place in many.
             different organs. The following steps tell the path of the famous choclate chip cookies.
             The first step of digestion begins at the mouth, where the food enters the mouth. Saliva is.
             secreted from the salivary glands. The saliva contains enzymes such as Ptyalin, which.
             starts sugar digestion. The enzymes also provide lubrication to help in the chewing and.
             swallowing of the food. The food then goes down the esophagus and into the stomach,.
             where the next step of digestion takes place. .
             In the stomach, a mixture of hydrochloric acid and Pepsin, which is secreted by the.
             stomach wall, liquefies the food. At the same time, a substance called intrinsic factor binds.
             Vitamin B in food and various gastric enzymes, such as Pepsin (which begins protein.
             digestion), which are secreted by the stomach wall. Secretions of mucus protect the.
             stomach from its digestive enzymes. The food is then mixed in the stomach, turning it into.
             partioally digested cookies, or chyme(digested food). The muscular pumping motion.
             called peristalsis churns the chyme around.
             The partially digested cookie then passes through the pyloric valve by peristalsis to the.
             first portion of the small intestine, the duodenum. The duodenum is where most of the.
             chemical digestion takes place. Here, bile from the gallbladder and enzymes from the.
             pancreas and intestinal walls combine with the chyme to begin the final part of digestion.
             Bile liquid is created in the liver, and stored in the gallbladder. Bile aids in the mechanical.
             digestion of fat. The pancreas and gland cells of the small intestine secrete digestive.
             enzymes that chemically break down complex of the cookie molecules into simpler ones.

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