124 



THE INTERNAL ENVIRONMENT OF THE BODY 



Part III 



••;*• 

 >••« 



H? 



Fig. 7.17. Drawing of a leucocyte (neutrophil) at half-minute intervals showing 

 its ameboid movement, and the intake of bacteria (black dots). The nucleus 

 (black) is many-shaped. (From Best and Taylor: The Living Body, ed. 3. Copy- 

 righted by Henry Holt and Co. Reprinted with their permission.) 



active macrophages (connective tissue), attack and take in the poisonous 

 alien matter. The ability of these cells to adjust themselves to a different situa- 

 tion is characteristic of protoplasm and a keystone in the body's defense 

 against injury. As the inflammation decreases, healing begins. Scar tissue 

 forms with new connective cells and white collagenous fibers. Some of the 

 macrophages remain in resting condition among the new connective tissue 



Tilpty ipUnten 



Dilated, congested 

 capUlarle* rnake 

 ^*su.'pface pedL, 



escaping ploLSma. 



capillaries and 

 - veriules cau.^e» 

 sv^ttUing. 



Fig. 7.18. Diagrams to show how leucocytes (neutrophils) migrate from small 

 congested blood vessels to combat bacteria introduced into the tissues by an injury. 

 (Courtesy, Ham, Histology, ed. 2. Philadelphia, J, B. Lippincott Co., 1953.) 



