CAPILLARY SYSTEMS. 



Q. What are the two capillary systems? 



Jl. The general capillary system, which is the seat of 

 the alteration of the red to the black blood ; and the pul- 

 monary capillary system in which the blood is converted 

 from black to red blood. 



Q. Whence the great importance of these capillary sys- 

 tems? 



Ji. They are the seats of the most important functions, 

 such as nutrition, secretion, digestion, absorption, exhala- 

 tion; the capillary circulations are governed by peculiar 

 laws; their tubes are the seats of inflammation, metastases; 

 and animal heat is engendered there. 



Q. In what animals are these systems exclusively the 

 organs of circulation ? 



i/2. In the lowest classes of animals. 



I. GENERAL CAPILLARY SYSTEM. 



Q. What is the extent of this? 



t/f. All the organs are composed of myriads of capilla- 

 ries, intercommunicating in every possible way; arterial 

 and venous ramifications pass into the interstices of the 

 organs; the organs themselves are composed of capilla- 

 ries. 



Q. Do yqu say that the capillaries are a class of vessels 

 distinct from the blood-vessels? 



ei. Not only so, but they give rise to the exhalents and 



