132 



Living Tlmigs Are Basically Alike unit ii 



Cell body 



Nucleus 



Intercellular material 



illustrations of voluntary and involuntary 

 muscle. Heart muscle differs from both 

 voluntary and involuntary muscle in its 

 appearance and in its activity. Connec- 

 tive tissue is a large group which includes 

 tissues of very different kinds. It includes 



Fig. 157 (upper left) (A) One type of epithe- 

 lial cell. HozD 7inp;ht the cilia be used? See also 

 flat epithelial cells in Fig. 139, page 106. (B) A 

 single cell of fat tissue. ]Vhat fills the greater 

 part of the cell? (C) Compare these fibers ii-ith 

 volimtary ?nuscle fibers. (D) This is a very 

 simple type of nerve cell. 



Fic. [58 (above) Voluntary vniscle fibers. The 

 dark spots are nuclei of cells. Do you see stripes 

 running across the fibers? (gknivUAl biolo(;ical 



SUl'PLV) 



Fk;. 159 (left) Cartilage tissue. Like bone, this 

 tissue has a large aniount of intcrcelhdar ma- 

 terial. 



bone and cartilage tissues, fat tissue, and 

 fibrous tissues. By some people blood is 

 considered to be one type of connective 

 tissue. Cartila{Te tissue is found covering^ 

 a portion of many bones. It contains no 

 mineral matter but a large amount of 

 firm intercellular matter which makes 

 the cartilage hard, slightly elastic, and 

 very smooth. See Figure 159. You can 



