. A healthy body. A textbook on anatomy, physiology, hygiene, alcohol, and narcotics. For use in intermediate grades in public and private schools . quent 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
. A healthy body. A textbook on anatomy, physiology, hygiene, alcohol, and narcotics. For use in intermediate grades in public and private schools . quent 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 swallowino\ Too much Fluid is injurious. It is a harmful prac-tice to wash down the food with large quantities ofwater or tea or liquid of any kind. The saliva will fur-nish moisture enough as a rule; for there are from oneto three pints of it poured into the mouth of an adult. Fig. 23. A side view of the lower jaw with the outer walls of bone removed,showing the teeth in proper place. (1) the two incisors ; (2) the canine ; (3)the tAvo bicuspids ; (4) the three lower molars (the last molar is sometimescalled the wisdom tooth); (5) a blood-vessel; (6) a nerve. each day. There is no harm in using a moderateamount of drinl^ with our meals, if it be of the righttemperature. Iced drinks should not be used underany circumstances, neither are very hot drinks much DIGESTION. 83 better. A glass of milk or a single glass of watershould be sufficient. Swallowing. By the act of swallowing, the soft massis carried from the mouth down the oesophagus, or gul-let, into the stomach. Here very important changestake place. 84 A HEALTHY BODY. CHAPTER XIII. DIGESTION IN THE STOMACH. The Stomach. The stomach of an adult is nearly a
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