. Human physiology. materialsabsorbed. Every kind of food is readily imbibed provided it isdissolved or reduced to such a finely-divided state that it iscapable of permeating their walls. It must be remembered thatthis absorption is carried on almost exclusively by the minutestblood-vessels (the capillaries), the walls of which are exceedinglythin. The other portion of the process of absorption referred to aboveis carried on by a system of vessels called the lymphatic system(see fig. 6), and the function performed by the vessels of thissystem is of such an important character that they are oft
. Human physiology. materialsabsorbed. Every kind of food is readily imbibed provided it isdissolved or reduced to such a finely-divided state that it iscapable of permeating their walls. It must be remembered thatthis absorption is carried on almost exclusively by the minutestblood-vessels (the capillaries), the walls of which are exceedinglythin. The other portion of the process of absorption referred to aboveis carried on by a system of vessels called the lymphatic system(see fig. 6), and the function performed by the vessels of thissystem is of such an important character that they are often saidto constitute the absorptive system. The lymphatic system (Lat. lympha, clear water) is so calledbecause its vessels usually contain a watery fluid. It consists oflymphatic capillaries, lymphatic vessels, glands, and two vessels-called lymphatic trunks, the larger of which is situated at the backof the thorax and is called the thoracic duct. The lymphatic capillaries are very minute vessels (Lat. ABSORPTION 3. Fig. 106.—Two IntestinalVilli. Magnified 100diameters. a, /?, and c, lacteals ; d, blood-vessels.
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