. Human physiology. nuously, at the rate of from thirty toforty ounces daily. If not needed atonce for digestion, it passes into thegall-bladder, where it is stored untilrequired. If digestion is going on, itpasses direct from the liver, where it issecreted, to the duodenum. The chief uses of the bile as adigestive fluid are (1) to assist in emul-sifying fats, (2) to moisten the mucousmembrane of the intestine, and (3) toact as a natural purgative by assistingthe muscular motions and the secretion ,/of the intestines. When the chyme passes into thesmall intestine, it is soon mingled withthe pa
. Human physiology. nuously, at the rate of from thirty toforty ounces daily. If not needed atonce for digestion, it passes into thegall-bladder, where it is stored untilrequired. If digestion is going on, itpasses direct from the liver, where it issecreted, to the duodenum. The chief uses of the bile as adigestive fluid are (1) to assist in emul-sifying fats, (2) to moisten the mucousmembrane of the intestine, and (3) toact as a natural purgative by assistingthe muscular motions and the secretion ,/of the intestines. When the chyme passes into thesmall intestine, it is soon mingled withthe pancreatic fluid, the bile, and thesecretions of the intestinal glands; andthese fluids, together with the salivaand the gastric fluid which form partof the chyme, complete the process ofdigestion; All kinds of foods are nowbeing dissolved, and by the worm-likemotions kept up by the muscular fibres ^^tfjESStf*?of the intestines, the whole is urgedslowly on. The dissolved portions arerapidly absorbed by the mucous mem-. Fig. 105.—The Ileo-ceecalValve. ; c, cae-cxcum and colon ; e and/, loose folds ofthe mucous membrane, formingthe ileo-csecal valve ; g, vermiformappendage. no ELEMENTARY PHYSIOLOGY brane, while the undigested and indigestible portions pass onwardtowards the rectum. As soon as the chyme is subjected to the influence of the bileand pancreatic fluid, its appearance is changed, the emulsified fatsgiving it the appearance of milk. The term chyle is applied to theemulsified contents of the small intestine. After the chyle has passed through the whole length of thesmall intestine, it enters the large intestine through an openingwhich is guarded by two folds of the mucous membrane. Thesefolds project into the large tube, and so prevent the reflux of thecontents into the small intestine. Thus they form a valve betweenthe ileum and the ccecum, which is known as the ileo-caecalvalve. Digestion continues in the large intestine; the dissolved por-tions are gradually absorbed,
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