ABSORPTION. 



143 



through the cell-wall, for it has a power of selection of chemical 

 materials from which to build itself up. Hence its nutritional 

 changes are not wholly osmotic. However, the life of all cells is 

 greatly dependent upon osmosis, for it must also transfer its waste 



Fig. 38a- Schema Showing the Routes by which the Digested Foods 

 Reach the Blood. (MoRAT.) 



CV, Chyle vessels. TC, Thoracic duct. PV, Portal vein. HV, Hepatic 

 vein. VC, Vena cava. //, Heart. L8C, Left subclavian vein. L, Liver. 7, 

 Intestine. 



products from its interior to the lymph. The life of the red-cor- 

 puscles is dependent upon osmotic pressure. 



The production of lymph, the absorption of water, glucoses, 

 and peptone from the intestine, the exchanges between the cells of 

 the tissues and the blood and the lymph in the formation of the 

 secretion, all require an explanation. In all these, osmotic pres- 



