CHAPTER X 



HUMAN TISSUES 



(Continued) 



Babe Ruth, home run king. 



Helen Wills, queen of tennis. 



JVhy is the body able to move? What tissue in the body makes 

 movement 'possible f How are messages carried from one part of the 

 body to another? In ivhat way are the different tissues structurally 

 related? What brings about coordination among the different parts 

 of the body? Why may blood be considered a tissue? 



Muscular tissues. All movement in the human body is brought 

 about by muscular or contractile tissues. Whether if is the raising 

 of an arm, the swallowing of food, the beating of the heart, con- 

 traction of the pupils of the eye in response to light, or the forma- 

 tion of so-called goose flesh in the skin when the body is cold, 

 the movement is the result of changes in the muscular tissue. 



Problem. Gross structure of skeletal muscle (unmagnified) . 



Secure some fore shank of meat from the butcher. Be sure to obtain a 

 piece that shows the attachment of some of the meat to the bone. Have the 

 butcher cut it up into enough sections to supply the class. 



The meaty part of the shank is composed largely of a type of muscle called 

 skeletal muscle because it moves the bones of the skeleton. This muscle is also 

 called voluntary because it is under the control of the will. 



I. Observe and describe the appearance of the muscle that is attached 

 to the bone. The contracting or shortening of this type of muscle will move the 

 bone by means of the strong inelastic tendons which are fastened to the bone. 



n. Find a piece of beef showing the outside of the muscle. Describe the 

 appearance of the covering or sheath. It is made of connective tissue. 



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