. True manhood : a manual for young men . of the stomach have a lining called mu-cous membrane, similar to that which lines the this are situated numerous small glands withducts opening into the stomach. These are calledgastric glands, and produce gastric juice. Without gastric juice there can be no digestion offood. It is an intensely sour secretion. The ele-ments peculiar to it are hydrochloric acid andpepsin. The mucous lining lies in folds when the stomachis empty ; these stretch out and increase the size of 7 98 TRUE MANHOOD. the cavity to accommodate the amount of food putin
. True manhood : a manual for young men . of the stomach have a lining called mu-cous membrane, similar to that which lines the this are situated numerous small glands withducts opening into the stomach. These are calledgastric glands, and produce gastric juice. Without gastric juice there can be no digestion offood. It is an intensely sour secretion. The ele-ments peculiar to it are hydrochloric acid andpepsin. The mucous lining lies in folds when the stomachis empty ; these stretch out and increase the size of 7 98 TRUE MANHOOD. the cavity to accommodate the amount of food putinto it. The outer coat of the stomach is smooth and highlypoKshed, and is called serous membrane. Betweenthis and the mucous membrane is interposed anothercomposed of three layers of elastic muscle which iscalled the muscular membrane. No sooner is the food packed away in this snug littlebox than the middle membrane begins to expand andcontract. One of its three layers of muscle runs thelong way of the stomach, another the short way, and. The Stomach. Fig. XXIII. I. The opening fJiroiigh which the food is passed intothe stomach. 9. The opening through ivhich the food is passed out ofthe stomach. 5. J. The serous membrane turned back. 6. The tnus-cular layer -which runs oblique. 7. The imiscular layer vjhich runsshortrvays 8. The muscular layer -which runs lengthruays. the other crossways. Each layer draws in and thenspreads out, after the manner of India rubber, andthis action is going on three ways at once, from thethree layers, and with so much force as to jar andmove the stomach. This imparts a steady, churning TRUE MANHOOD. 99 motion to its contents, which, with the pressure offood inside, crushes the ripe gland cells and makesthem pour out their secretion. The stomach is easily affected by the mind. Sud-den disappointment, or bad news received during theprogress of meals or soon afterward has been knownto take away the appetite and even to cause vomit-ing ; force is diverte
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