A treatise on physiology and hygiene for educational institutions and general readers .. . ed in folds with an immensenumber of thread-like prolongations, called villi, which indefinitelymultiply its absorbing capacity. These villi give the surface theappearance and smoothness of velvet, and during digestion they dip into the canal, and, by meansof their blood-vessels, absorbits fluid contents, just as thespongioles which terminatethe rootlets of plants, imbibemoisture from the surrounding soil. 38. Secondly, absorptionis also effected by the lac-teals, a set of vessels pecu-j$ har to the smal
A treatise on physiology and hygiene for educational institutions and general readers .. . ed in folds with an immensenumber of thread-like prolongations, called villi, which indefinitelymultiply its absorbing capacity. These villi give the surface theappearance and smoothness of velvet, and during digestion they dip into the canal, and, by meansof their blood-vessels, absorbits fluid contents, just as thespongioles which terminatethe rootlets of plants, imbibemoisture from the surrounding soil. 38. Secondly, absorptionis also effected by the lac-teals, a set of vessels pecu-j$ har to the small have their beginningsin the little villi just men-tioned, side by side with theblood-vessels. These two setsof absorbents run in differentcourses, but their destinationis the same, which is theright side of the heart. Thelacteals receive their namefrom their milky-white ap-pearance. After a meal containing a portion of fat, they are dis-tended with chyle, which they are specially adapted to receive; atother times they are hardly discernible. The lacteals all unite to. —A ^^^ D B Fig. 28.—The , Small Intestine. B, , Thoracic Duct. D, Absorbents. E, Blood-vessel. 37. The next process? Give the first way? 38. How is absorption effected in another way?Thoracic duct? Describe it. Name of the lacteals? DIGESTION. 121 form one tube, the thoracic duct, which passes upward through thethorax, or chest, and empties into a large vein, situated just beneaththe left collar-bone. 39. The Absorbents.—The lacteals belong to a class of vesselsknown as absorbents, or lymphatics, which exist in nearly all partsof the body, except the brain and spinal cord. The fluid whichcirculates through the lymphatics of the limbs, and all the organsnot concerned in digestion, is called lymph. This fluid is clear andcolorless, like water, and thus differs from the milky chyle whichthe lacteals carry after digestion : it consists chiefly of the waterypart of the blood
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Keywords: ., bookcentury1800, bookdecade1, booksubjectphysiology, bookyear1884
