. Principles of modern biology. Biology. STOMACH i \ - I SPLEEN V\ S / PANCREAS SMALL INTESTINE D_ DESCENDING COLON APPENDIX RECTUM I JKotf t Pdnwtn Fig. 16-24. Abdominal part of the human digestive tract (semidiagrammatic). denum occupies a fixed position in the abdominal cavity, because it is attached di- rectly to the dorsal body wall. All other parts of the small gut, in contrast, enjoy some free- dom of movement, because they are sus- pended to the dorsal body wall by a thin, transparent, sheetlike membrane, the mesen- tery. This mesentery also provides a connec- tion between the intestin
. Principles of modern biology. Biology. STOMACH i \ - I SPLEEN V\ S / PANCREAS SMALL INTESTINE D_ DESCENDING COLON APPENDIX RECTUM I JKotf t Pdnwtn Fig. 16-24. Abdominal part of the human digestive tract (semidiagrammatic). denum occupies a fixed position in the abdominal cavity, because it is attached di- rectly to the dorsal body wall. All other parts of the small gut, in contrast, enjoy some free- dom of movement, because they are sus- pended to the dorsal body wall by a thin, transparent, sheetlike membrane, the mesen- tery. This mesentery also provides a connec- tion between the intestine and the body wall, through which nerves and blood vessels pass to and from these otherwise isolated Fig. 16-25. Magnified view of the inside surface of the small intestine showing the numerous villi. The second and third parts of the small intestine are, respectively, the jejunum and the ileum. The jejunum is about 10 feet in length, and displays a greater number of the intestinal glands and a lesser number of villi than the ileum. The ileum ter- minates abruptly in the lower right region of the abdominal cavity, at which point it joins the colon, or large intestine (Fig. 16-24). Relations of the Duodenum to the Liver and Pancreas. Each small sample of the chyme passes from the stomach into the duodenum, whereupon it immediately encounters a copious flow of both the pancreatic juice and the bile. These two juices flow into the duo- denum together, because the bile duct and pancreatic duct join each other, forming a short common duct that penetrates the duo- denal wall (Fig. 16-24). The Pancreatic Juice. The inorganic com- ponents of the pancreatic juice are mainly water (about 98 percent by weight), and various inorganic salts. Among these salts there is an unusually high concentration of the alkaline salt, sodium bicarbonate, which. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration
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