The principles of health control . or that show badly under X-rayexamination, should be extracted. 4. To prevent tooth decay. — This is accomplished byavoiding acid mouth, as explained above, and by havingall dental work attended to just as soon as it is needed.(See Health Work.) Digestion a Chemical Process. — The student of chem-istry knows to what an extent care must be employed in allkinds of chemicalwork (Fig. 35). Nomatter how simplethe experiment, theexpected results arenot obtained unlessthe conditions gov-erning them are sup-plied. If there iscarelessness in theuse of reagents, alack
The principles of health control . or that show badly under X-rayexamination, should be extracted. 4. To prevent tooth decay. — This is accomplished byavoiding acid mouth, as explained above, and by havingall dental work attended to just as soon as it is needed.(See Health Work.) Digestion a Chemical Process. — The student of chem-istry knows to what an extent care must be employed in allkinds of chemicalwork (Fig. 35). Nomatter how simplethe experiment, theexpected results arenot obtained unlessthe conditions gov-erning them are sup-plied. If there iscarelessness in theuse of reagents, alack of clean appa-ratus, too much ortoo little heat, theexperiment in the per-formance of the greatchemical process,known as digestion, depends no less upon the fulfilmentof necessary conditions. If these are overlooked, theprocess is carried on imperfectly — it may be withharmful results. While successful digestion dependsindirectly upon many conditions, these bear for the mostpart upon two essential requirements:. Fig. 35. — A Chemical Experiment. Sug-gestive of an important chemical processwhich everyone should know how to carryon successfully. 164 PRINCIPLES OF HEALTH CONTROL i. The secretion of digestive fluids of a desirablequality and in sufficient amounts. 2. The maintenance of a healthy and clean conditionof the food canal. Office of the Digestive Fluids. — The conversion ofthe solid foods to a liquid form is accomplished throughthe juices secreted by the various glands. These consistlargely of water, the dissolving agent, but each, with theexception of the bile, contains one or more active con-stituents, called enzymes. The enzymes change the foodchemically, converting the insoluble proteins, fats, andstarch into soluble substances, such as peptone, sugar,and glycerine. The efficiency of the digestive processesmust, therefore, depend upon the nature and quantityof the digestive fluids, and these in turn upon the healthand activity of the glands whi
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Keywords: ., bookcentury1900, bookdecade1920, booksubjecthygiene, bookyear1920
