. A healthy body. A textbook on anatomy, physiology, hygiene, alcohol, and narcotics. For use in intermediate grades in public and private schools . ourishment from the ground, so thesevilli take up the digested food. It would not be far AHSORPriON. 103 from correct to say that tlio digested food soaks throughthe thin walls of the villi as water soaks through a cloth. Once inthese little vessels,the absorbed foodflows into largervessels, as shownin Fig. 31, at theright, and these willsoon unite togetherin one or two stilllarger vessels. Riv-ers are formed onthe same streams flowfrom
. A healthy body. A textbook on anatomy, physiology, hygiene, alcohol, and narcotics. For use in intermediate grades in public and private schools . ourishment from the ground, so thesevilli take up the digested food. It would not be far AHSORPriON. 103 from correct to say that tlio digested food soaks throughthe thin walls of the villi as water soaks through a cloth. Once inthese little vessels,the absorbed foodflows into largervessels, as shownin Fig. 31, at theright, and these willsoon unite togetherin one or two stilllarger vessels. Riv-ers are formed onthe same streams flowfrom many direc-tions ; these flowinto each other tomake larger ones;and finally theseunite together tomake one broadstream. Although theblood-vessels andlacteals absorb thedigested foods yet Fig. 32. i, intestine : (1) villi with central lac the WOrk of the lac-teals; (2) villi with blood-vessels. L, lymphatic . . .. pp^frpor lacteal vessels. G, lymphatic gland. D, tho- i^ti^^^? ^^i ^^^^ Ltuuuracic dnct. p, portal vein. L, liver, at the left of tllC villi is laroC-of the fic^ire. v, vein, H, heart. A, right au-ricle of heart, ly to take up the. 104 A HEALTHY BODY. digested fats, while the blood-vessels take up principallythe other digested foods. The Portal Vein. The blood-vessels of the villi soonunite with each other to make a large vein, called theportal vein. This goes directly from the intestine tothe liver. Pig. 32 shows where this vein begins, andwhere it ends. Its duty is to carry the digested foodsto the liver. Prom this organ they will be conveyedinto a large vein in the direction of the arrows of thefigure. Thus the blood, with its digested foods, getsinto the right side of the heart, and from the heart itwill soon reach all parts of the body. The Thoracic Duct. The lacteals, or lymphatics, thatare in the centre of the villi soon unite to make a largevessel, called the thoracic duct. This duct is as largeas an ordinary slate pencil, and it lies in front of thespinal col
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