42 



HUMAN PHYSIOLOGY. 



Osmosis and filtration are conditions, however, made use of by the cells in 

 the absorptive process. 



The Products of digestion find their way into the general circulation by 

 two routes : 



I. The water , peptones, glucose and soluble sails, after passing into the 

 lymph spaces of the villi, pass through the wall of the capillary blood vessel ; 

 entering the blood, they are carried to the liver by the vessels uniting to 



FIG. 6. 



Diagram of the portal vein (/&) arising in the alimentary tract and spleen (s), and car- 

 rying the blood from these organs to the liver. From Yea's Text-Book of P/q 



hysiology. 



form the portal vein ; emerging from the liver, they are emptied into the 

 inferior vena cava by the hepatic vein. 



2. The emulsified fat enters the lymph capillary in the interior of the 

 villus; by the contraction of the layer of muscular fibres surrounding it 

 its contents are forced onward into the lymphatic vessel or lacteal ; thence 



