Stomach from the hydrochloric acid and pepsin the

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stomach from the hydrochloric acid and pepsin, the stomach glands secrete a mucus to protect the lining of the stomach. Next a mechanical mixing, peristalsis, further mixes the food into the chemical enzymes. After some time (typically 1-2 hours) the bolus is now called chyme, a thick liquid. Hour 3: Next a mechanical mixing further mixes the food into the chemical enzymes. This action is called peristalsis. After some time the bolus is now called chyme, a thick liquid. The process from solid food to chyme typically takes about 1 to 2 hours to complete. Hour 4: When the pyloric sphincter valve opens, the chyme then enters the duodenum where it mixes with digestive juices from the pancreas. (Before this happens, however, the acidity of the chyme must be reduced through the release of bicarbonate by secretin.) These enzymes are called pancreatic amylase. The amylase breaks down the polysaccharide into a chain of only two sugars linked together. Hour 5: Digestion then continues in the small intestine. The small intestine contains the enzymes lactase, sucrase, and maltase. The enzymes break down the chain of two into single sugars. These simple sugars are then absorbed in the small intestine. Hour 6: Peristalsis continues to move the food along the small intestine. The small intestine is undoubtedly the most important part of digestion. It is here where nutrients are absorbed. In this case, a simple sugar used for energy and storage. Hour 7: Finally the sugars are broken down to the point where they can easily pass across cell membranes. Absorption of glucose receives transport across the intestinal lumen, across the epithelium and into the blood. From the small intestine the simple sugars can then provide energy and storage for the rest of the body. Any remaining unusable substances will simply be passed through the colon and out of the body.
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  • Summer '14
  • MarcSpear

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