Elementary anatomy, physiology and hygiene for higher grammar grades . lse. An important part of the lymphatic system is that which collects the tis-/ sue fluid from the in- testine, carrying it tothe thoracic duct (). This portion ofthe lymphatic systemdiffers from the restin carrying absorbedfoods from the intes-tines to the circula-tory system. The veins of the in-testine carry part oft^jie food, but the lym-phatics carry all ofthe absorbed fat. Thisfat is in the form ofan emulsion somethinglike cream, and makesthe lymphatics of theintestine look white, as• / though they were fiU
Elementary anatomy, physiology and hygiene for higher grammar grades . lse. An important part of the lymphatic system is that which collects the tis-/ sue fluid from the in- testine, carrying it tothe thoracic duct (). This portion ofthe lymphatic systemdiffers from the restin carrying absorbedfoods from the intes-tines to the circula-tory system. The veins of the in-testine carry part oft^jie food, but the lym-phatics carry all ofthe absorbed fat. Thisfat is in the form ofan emulsion somethinglike cream, and makesthe lymphatics of theintestine look white, as• / though they were fiUed T. i» T * 1 *^ ? ^ . ? with milk. For this Fig. 38. — Lacteals, thoracic duct, etc. a, in-testine; 6, vena cava inferior; c, c, right reason these particular and left subclavian veins ;d point ol open- lymphatics have beening of thoracic duct into left subclavian. •• r ^^^^ [Daiton.] called lacteals (from the Latin lac, milk).This white lymph is sufficiently different from the restof the lymph of the body to have a separate name; it iscalled CIRCULATION 151 8. THE CONTROL OF THE CIRCULATIONCONTROL OF THE HEART Put your finger upon your pulse and count the numberof times it beats in a minute. Count it again and see ifyou can make it beat faster this tinje than before. Youwill probably find, if you have been sitting still duringyour counting, that it beats just about the same fromminute to minute, and that you cannot of your own willmake it beat faster or slower. Now if you will lie downupon a bench or couch, and breathe very deeply and veryslowly for five or ten minutes, and let some one else countyour pulse, you will find that it is slower than it wasat your first observation. If you take some brisk and vigorous exercise, like run-ning up and down a flight of stairs two or three times, orrunning around the schoolhouse two or three times, youwill find that the heart is beating very much more rapidlyand strongly than at your first observation. This experiment
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