28 ELEMENTARY PHYSIOLOGY. 



lesson. Show how the muscles are grouped about the upper 

 part and gradually taper down to the bone. Below the muscle, 

 lying along the bone, is a tendon. Separate the muscle. If 

 the "drum-stick" has become cold, after having been cooked, 

 you may hear the crackling of the delicate little sheaths which 

 encase the fibers. When you have removed all the muscles, 

 you have left two representatives of the bony system the 

 larger bone, the tibia, and the slender bone by its side, the 

 fibula, corresponding, in position, to the same bones in the 

 human body. 



TEST QUESTIONS. 



What part of the body do the muscles form? 



What is the usual color of the muscles? 



How many muscles are in the body? 



What can you tell of the structure of a muscle? 



How do muscles differ in shape? 



What is the shape of the muscle which closes the eye? 



What and where is the longest muscle of the body? 



What is the use of the tendons? 



Can you explain how the tendons assist in giving a graceful 



shape to the body? 

 What is the use of the muscles? 



What parts, besides the bones, are moved by the muscles? 

 Can you give an illustration of the language of the muscles? 

 What is meant by a voluntary muscle? 

 What is an involuntary muscle? 

 What is meant by the contraction of a muscle? 

 What by relaxation? 



What is the difference between a flexor and extensor muscle? 

 What are antagonists or counter muscles? 

 How is a muscle affected by being unused? 

 What is the result of too severe exercise? 

 Is a bulky body always a strong body? 

 What is likely to make the body bulky? 



