. Animal biology. Zoology; Biology. 322 METAZOAN PHYLA The pharynx in the lower vertebrates is respiratory in function, since in its walls lie the gill slits. In the higher forms it serves as a common passageway for the food from the mouth into the esophagus and for the air from the nasal chamber into the windpipe, or trachea. Nasa/ chamber Tongue Larynx Trachea Soff- pcf/ahe — Pharynx Esophagus Liver Gall bladder Pyloric Opening Transi/erse colon /iscenpfinq- colon. Lung Cardiac opening Diaphragm Spleen Descending colon Appendix ^RecTurn Fig. 215.—Alimentary canal of man. {From Sobotta, "
. Animal biology. Zoology; Biology. 322 METAZOAN PHYLA The pharynx in the lower vertebrates is respiratory in function, since in its walls lie the gill slits. In the higher forms it serves as a common passageway for the food from the mouth into the esophagus and for the air from the nasal chamber into the windpipe, or trachea. Nasa/ chamber Tongue Larynx Trachea Soff- pcf/ahe — Pharynx Esophagus Liver Gall bladder Pyloric Opening Transi/erse colon /iscenpfinq- colon. Lung Cardiac opening Diaphragm Spleen Descending colon Appendix ^RecTurn Fig. 215.—Alimentary canal of man. {From Sobotta, "Deskriptivc Anatomie," by the courtesy of J. F. Lchmann's Verlag.) The esophagus may be simply a passageway for food on its way to the stomach, or as in the case of many birds, it may be dilated to form a crop for the storage of food. The stomach is an organ in which the food is reduced to liquid form and in which a certain amount of digestion takes place. In the walls of the stomach are glands which secrete pepsin and rennin and also hydro- chloric acid, giving to the contents an acid reaction. The rennin, in this acid medium, serves to coagulate the protein of milk, separating it as the. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Wolcott, Robert Henry, 1868-1934. New York ; London : McGraw-Hill Book Company, Inc.
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