. Advanced biology. Biology; Physiology; Reproduction. INTESTINAL DIGESTION 133 simple sugars. Some of these enzymes complete the digestion of starch and sugar which was started in the mouth. Another con- stituent, enterokijiase, causes the trypsinogen of pancreatic juice to form trypsin. There is also an active hormone, secretin, in the intestinal juice. It has no digestive action but passes into the blood stream and is carried to the liver and the pancreas, which it activates. (A hormone is a chemical substance formed in one part of the body and activating another part.) It has been found th
. Advanced biology. Biology; Physiology; Reproduction. INTESTINAL DIGESTION 133 simple sugars. Some of these enzymes complete the digestion of starch and sugar which was started in the mouth. Another con- stituent, enterokijiase, causes the trypsinogen of pancreatic juice to form trypsin. There is also an active hormone, secretin, in the intestinal juice. It has no digestive action but passes into the blood stream and is carried to the liver and the pancreas, which it activates. (A hormone is a chemical substance formed in one part of the body and activating another part.) It has been found that if a dog is fed and some of its blood in the vein lead- ing from the intestine is introduced into the blood of another dog, the liver in the second dog immediately secretes a large amount of bile, and the pancreas secretes pancreatic juice, which shows that a hormone must have passed through the blood and was carried to the pancreas and the liver. In the human body, most of the food is digested in the small intestine because the food stays there longest. It has been estimated, from obser- vations, that the last food of a meal passes out of the small intestine about ten hours after eating. There are more enzymes in this part of the digestive tract than in any part of the canal, which, also, accounts for the large amount of digestion that occurs here. The large intestine leads from the small intestine. It is about five feet long, and about two and one half inches in its broadest part. A little pouch is formed where the large intestine connects with the small intestine. Leading from this pouch is a short, narrow, wormlike tube, usually less than the diameter of an ordinary lead pencil,. intestine* xnt>dStxn«x vermi/orin-. Enough of the small intestine and large intes- tine are shown to make clear the position of the appendix. Note the opening of the Please note that these images are extracted from scanned page images that may have been digitally enhanced for read
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Keywords: ., bookcentury1900, bookdecade1920, booksubje, booksubjectphysiology
