76 



PHYSIOLOGY 



blood in fairly constant amounts. If through excessive 

 eating an excess of proteid is received, it remains in 

 the blood in the form of the blood proteids until it is 

 given up to the tissues for use. If there is an excess 

 of sugar, it is stored in the liver temporarily until there 

 is a deficiency in the blood. If there is an excess of 

 fat, it may be stored in any cell, but especially in the 

 connective tissue cells, where it is apt to become perma- 

 nent. If there is a deficiency of these substances in 



Pig. 50 A.— Coagulated blood highly magnified, a, "Red corpuscle much enlarged; 

 b, Cross section of red corpuscle; c, Rouleau of red corpuscles; d, White cor- 

 puscles; /, Fibrin. (From Fitz.) 



the blood the tissues themselves waste away and supply 

 the lack. 



The Red Corpuscles. — Both red and white corpuscles 

 are isolated living cells (Fig. 50). They resemble one- 

 celled organisms, but they differ greatly from each other 



