. Elementary biology; an introduction to the science of life . Fig. 28. The digestive organs in man (7, entrance to mouth ; b, the pharynx, — a sort of vestibule with seven passages leading out of it, two to the nostrils, one to the mouth, one to the gullet, one to the windpipe, and one to each ear (the Eustachian tubes, see p. 240) ; <:, the gullet, or esophagus; ci, the stomach; e, the pylonis, opening from the stomach to the small intestine ; f, the liver ; g, the gall bladder; h, duct from the gall bladder and the liver to the small intestine; i, duct from the pancreas to the small inte
. Elementary biology; an introduction to the science of life . Fig. 28. The digestive organs in man (7, entrance to mouth ; b, the pharynx, — a sort of vestibule with seven passages leading out of it, two to the nostrils, one to the mouth, one to the gullet, one to the windpipe, and one to each ear (the Eustachian tubes, see p. 240) ; <:, the gullet, or esophagus; ci, the stomach; e, the pylonis, opening from the stomach to the small intestine ; f, the liver ; g, the gall bladder; h, duct from the gall bladder and the liver to the small intestine; i, duct from the pancreas to the small intestine; /, small intestine ; k, large intestine; /, vermiform appendix ; m, rectum ; n, the diaphragm, separat- ing the chest cavity from the abdominal cavity; o, the pancreas. The arrows indicate the course taken by food in passing from the mouth through the alimentary canal j^p^ ^^^ yOU Can SCC, shoW- ing through the skin, one wave of contraction after another pass along the gullet, from the head to the trunk. The thorough mixing of saliva with the food makes it easier for the whole mass to slide along into the throat, and later into the gullet, since the surface of the mass is thus coated with the slippery mucin of the saliva. 117. Swallowing. After the mouthful of food has been thoroughly chewed, it is pushed back by the tongue and passed into the throat chamber, or pharynx (see Fig. 28, b), from which it passes di- rectly into the gullet, or esophagus. The swallow- ing is not merely a falling down of the food from the pharynx into the stomach. It is an active carrying brought about by the suc- cessive contraction of rings of muscles that lie in a series in the wail of the gullet. If you watch a horse drinking water from a pond or from a pail set on the ground, you can see him swallow the water
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Keywords: ., bookcentury1900, bookdecade1920, bookpublishe, booksubjectbiology
