. Text-book of anatomy and physiology for nurses. ne. The epithelial cells with which they are coveredtake up and transmit the new substances (formed by digestion) intolymph spaces within the \illus, from which they go either intothe blood-vessels or lymph capillaries (page 149) which it contains. Wafer and mineral salts (dissolved in the water).—These must pass intothe blood capillaries, thence into intestinnl veins, and through them to theportal vein (page 188). By this they are taken to the liver. Sugars, dextrose and levulose (which result from the digestion of carbo-hydrates). These pass
. Text-book of anatomy and physiology for nurses. ne. The epithelial cells with which they are coveredtake up and transmit the new substances (formed by digestion) intolymph spaces within the \illus, from which they go either intothe blood-vessels or lymph capillaries (page 149) which it contains. Wafer and mineral salts (dissolved in the water).—These must pass intothe blood capillaries, thence into intestinnl veins, and through them to theportal vein (page 188). By this they are taken to the liver. Sugars, dextrose and levulose (which result from the digestion of carbo-hydrates). These pass by the same route, namely, blood capillaries andveins to the liver. Peptones also find their way in the same manner to the portal blood andthe liver. ABSORPTION OF FOOD. 149 Thus it appears that all proteins, sugars, water and salts passthrough the liver. There, water and salts are used for variouscombinations; sugars are converted into glycogen to a great extentand stored for future use; and proteids furnish tissue food andmaterials for Fig. 107—Section of Ixtected Small Intestine of Cat. a, b. Mucosa, g. Their absorbent vessels, h. Simple foUices. c. Muscularis mucosa^. 7. Submucosa.^, e. Circular and longitudinal layers of muscle. /. Fibrous coat. All the dark linesrepresent blood-vessles filled with the injection mass (Piersol). Glycogen.—This product of the action of liver cells upon carbohydrates isstored in the liver. When needed it is returned to the blood (as sugar again)and distributed to the tissues, notably to the muscles. Being readily oxidized itfavors the rapid changes in muscles which result in motion. Therefore, itfollows that sugar and starch are sources of muscle energy. Urea.—This is another substance which appears as a result of the activityof the liver cell. It represents the final form of waste derived from the metab-olism of proteid substances. It is a very poisonous waste and is eliminated fromthe blood by the kidneys. Having yie
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