. A healthy body. A textbook on anatomy, physiology, hygiene, alcohol, and narcotics. For use in intermediate grades in public and private schools . Fig. 22. Three teeth broken open to show thecavity on the inside. Surrounding the top of eachtooth is the enamel. The two teeth to the left arebut little larger than natural; the one to the rightis more highly magnified. Slow and Thorough Mastication. One of the mostfrequent causes of trouble with the stomach is toorapid eating. The solid foods should be chewed veryfinely, and all food well mixed with the saliva. The Object of Mastication. The sal
. A healthy body. A textbook on anatomy, physiology, hygiene, alcohol, and narcotics. For use in intermediate grades in public and private schools . Fig. 22. Three teeth broken open to show thecavity on the inside. Surrounding the top of eachtooth is the enamel. The two teeth to the left arebut little larger than natural; the one to the rightis more highly magnified. Slow and Thorough Mastication. One of the mostfrequent causes of trouble with the stomach is toorapid eating. The solid foods should be chewed veryfinely, and all food well mixed with the saliva. The Object of Mastication. The saliva has the powerof changing the starch of our food into sugar. As allstarch must be thus changed before it can be taken upby the blood-vessels, it follows that the action of thisfluid is important. However, not all the starch is con-verted into sugar while it is in the mouth. The food isin the mouth such a short time that only a part of it isaffected. The rest is changed at a later period farther 82 A HEALTHY BODY. down the alimentary canal. The principal object ofmastication is to finely divide the solid foods and tomoisten them for swallow
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