. Human physiology : designed for colleges and the higher classes in schools, and for general reading. nutriment into theblood for the growth and repair of the body. 91. I now go on to describe the remainder of the process ofdigestion. The chyme, (§ 83,) as it passes into the small intes-tine from the stomach, has mingled with it the bile and thesecretion of the pancreas. These are poured into the intestineat the point represented at 0, in Fig. 14. These secretions un-doubtedly have some agency in separating the nutritious part 68 HUMAN PHYSIOLOGY. Chyme. Chyle. Lacteali. Thoracic duct. of the
. Human physiology : designed for colleges and the higher classes in schools, and for general reading. nutriment into theblood for the growth and repair of the body. 91. I now go on to describe the remainder of the process ofdigestion. The chyme, (§ 83,) as it passes into the small intes-tine from the stomach, has mingled with it the bile and thesecretion of the pancreas. These are poured into the intestineat the point represented at 0, in Fig. 14. These secretions un-doubtedly have some agency in separating the nutritious part 68 HUMAN PHYSIOLOGY. Chyme. Chyle. Lacteali. Thoracic duct. of the chyme from that which is not so. When thus separat-ed, it is absorbed by the innumerable small vessels, called lac-teals, which are situated in the mucous membrane. This nutri-tijus part of the chyme is a milky fluid, called the chyle. Thelacteals which absorb it are little tubes or ducts. These entercertain glands, called the mesenteric glands, for the purpose ofhaving some effect, we know not what, produced upon it. Theythen pass on, as seen in Fig. 17, to pour their contents into the FIG. SECTION OF INTESTINE SHOWING THE LACTEALS. thoracic duct. This duct, which is about the size of a commonquill, running up on the left side of the aorta, the great arteryof the heart, pours its contents into the junction of two veinsat the top of the chest. As the circulation of the chyle in the DIGESTION. 59 Mechanical contrivance of the thoracic duct. Chyle makes blood. thoracic duct needs all the mechanical help that it can have, themode of the joining of this duct with these veins is calculatedto facilitate the freeness of the discharge of the chyle. Asthe two large currents in the veins, v and v, v, in Fig. 18, FIG. 18.
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