The outlines of anatomy, physiology, and hygiene Being an edition of The essentials of anatomy, physiology, and hygiene, rev to conform to the legislation making the effects of alcohol and other narcotics upon the human system a mandatory study in public schools . e change, and if purefluid albumen be injected directly into the blood, itwill be thrown out of the body by the kidneys un-altered. To prepare the various foods for use inthe body, we are provided with a complicated seriesof organs, called the digestive apparatus, in whichthe food is ground fine and mingled with variousjuices until i
The outlines of anatomy, physiology, and hygiene Being an edition of The essentials of anatomy, physiology, and hygiene, rev to conform to the legislation making the effects of alcohol and other narcotics upon the human system a mandatory study in public schools . e change, and if purefluid albumen be injected directly into the blood, itwill be thrown out of the body by the kidneys un-altered. To prepare the various foods for use inthe body, we are provided with a complicated seriesof organs, called the digestive apparatus, in whichthe food is ground fine and mingled with variousjuices until it is reduced to a fluid mass, which canbe taken up by the blood and carried to all partsof the body in a condition fit for their nutrition. 85. Processes to which Food is subjected inthe Body.—The process of preparing food for ournourishment may be conveniently divided intofive stages. The first of these is inastieation, whichtakes place in the mouth, and is a voluntary second is swallozving, or the act of passing foodon from the mouth to the stomach, the beginningof this act being voluntary, and the greater part ofit involuntary. The tJiird is stomacJi digestioti, whichis involuntary ; the fourth, intestinal digestion, which 66 ORGANS OF Fig. 19.—Front view of the organs in their natural relations. The heart ispartly covered by the lungs, but its true outline is indicated by a dottedline. Only ten ribs are shown on each side, the eleventh and twelfth(the floating ribs) being too short to be included in the section. MASTIC A TIOX.—S WALLO WLXG. 67 is involuntary; and the fifth is the process of ab-sorption, which is also a process of selection, bywhich certain portions of the prepared mass aretaken up into the circulation for food, and the restleft in the intestines as waste material; this wholeprocess is also beyond the control of our will; allwaste matters are then expelled from the body. 86. Only One Voluntary Process.—All of theseprocesses must be p
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