46 TEXT-BOOK OF PHYSIOLOGY 



secretion, sensation and other forms of nerve activity. When muscles and 

 bones are applied to the overcoming of opposing forces, mechanic work is 

 accomplished. In the following chapters some of the problems connected 

 with the activities of the primary mechanisms, the skeletal, muscle and 

 nerve tissues will be first considered and subsequently some of the problems 

 connected with the activities of the secondary mechanisms. 



