ELEMENTS OF MAMMALIAN ANATOMY. 



a special liquid state capable of being absorbed by the 

 millions of minute finger-like villi of the small intestine 

 ( Fig. 63). Thence it is transferred by the lacteal vessels 

 and veins to the heart, whence it is conveyed by the 

 arteries to their capillary distribution in the neighbor- 

 hood of every cell in the body. 



The dead matter or waste material resulting from the 

 cell activity is of two kinds, gaseous and liquid. Both 

 diffuse through the capillary walls into the blood. The 



FIG. 11. FIBERS OF CONNECTIVE TISSUE. X 300. 



former, which is carbon dioxid, is carried to the heart 

 and thence by the pulmonary arteries to the lungs, where 

 it passes into the terminal branches of the trachea, and 

 finally by expiration reaches the exterior. The liquid 

 excretion is transported by means of the veins and arte- 

 ries to the kidneys, where it diffuses through the walls 

 of the capillaries into the minute tubules opening into 

 the ureters leading to the bladder. It must be remem- 

 bered that the material known as feces passed out of 

 the alimentary canal through the anus is not an excretion 



