File:The human body and health - an elementary text-book of essential anatomy, applied physiology and practical hygiene for schools (1908) (14749934976).jpg

Identifier: humanbodyhealthe00davi (find matches)
Title: The human body and health : an elementary text-book of essential anatomy, applied physiology and practical hygiene for schools
Year: 1908 (1900s)
Authors: Davison, Alvin, 1868-1915
Subjects: Physiology Hygiene
Publisher: New York : American Book Company
Contributing Library: Columbia University Libraries
Digitizing Sponsor: Open Knowledge Commons

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rom one another.Magnified. THE LACTEALS 99 gle vessel leading into the lacteal system (Fig. 63). Thefood passes through the epithelial cells, and then the fatsare taken up by the lacteal vessels, while the other partof the food is absorbed by the blood capillaries unitingto form the portalsystem leading tothe liver (^Fig. 64).The Lacteals. —These vessels forma part of the hmphsystem.which servesto return to theveins in the neckthat portion of theblood c OB stantlyoozino out of thecapillaries in allregions of the body.The lacteals consistof millions of mi- fig. 6nute vessels begin-nino- blindlv in thevilli and other partsof the intestine anduniting into a scoreor more of threadlike tubes which converge in theircourse to enter the lower part of the left thoracic duct(Fig. 64). This duct is a tube about as large as a leadpencil, lying in front and to one side of the backbone.It leads into a large vein in the neck. The fats, uponentering the lacteals, are forced along by the pressure of
Text Appearing After Image:
Diagram of the structure of a blockof tissue smaller thau a pius head, cut from thewall of the small intestine, a, mouths of theintestinal glands; h, villus cut lengthwise toshow the blood capillaries and white lactealwithin: e, lacteal vessel sending branches tomany villi: /, intestinal glands ; /»,arteiy; v,vein : I and f. muscular coats. 100 HOW FOOD IS DIGESTED the moving intestines, by breathing, and also by the suc-tion in the thoracic duct caused by the rushing along ofthe blood past its mouth. If a cat or dog be given a mealof rich milk and killed about three hours later, the numerous small lacteal vessels willappear white, because of the fatin them. The Portal System. —The portalsystem consists of a large portalvein, with its tributaries beginningin the capillaries of the intestine,stomach, and other abdominalorgans, and its branches ending inthe capillaries of the liv6r. Thecapillaries do not actually termi-nate in the liver, but are continuouswith the capillaries forming

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