120 



ANATOMY FOR NURSES 



[Chap. VII 



Classification < 



r Striated 

 Cardiac < Involuntary 

 I Visceral 



y^ 



Stimxili 



Characteristics 



Contraction 



Fatigue 



Skeletal 

 Muscles 



1. Striated but not distinctly. 



2. Not under control of will. 



3. Made of square bundles of 

 fibres. 



4. Fibres are elongated cells, 

 contain just one nucleus, no 

 sarcolenuna. 



5. Fine fibrils from cells form a 

 network. 



6. Connective tissue framework. 



7. Contracts and relaxes quickly 

 and unceasingly during life. 



Term used to describe influences which irritate or stimu- 

 late. 



1. Chemical. 



2. Mechanical. 

 Varieties \ 3. Thermal. 



4. Electrical. 



5. Nervous — important one. 



1. Irritabihty — response to a stiumlus. 



2. Contractility — muscle becomes shorter and thicker. 



3. Extensibility — muscle can be stretched. 



4. Elasticity — muscle readily returns to original shape. 



5. Tonicity — mild, sustained contraction. 



„, . , ^, / Fibres shorten. 



Physical Change ( pi^res thicken. 



' Take up oxj'gen. 



r Carbon dioxide. 

 Formation of I Sarcolactic acid. 



i Various otherwastes. 

 Heat is liberated. 

 , Energy is set free. 



Accumulation of waste poisons. 

 Loss of nutritive material. 



/ Origin — more fixed attachment. 



1 Insertion — more movable attachment. 



Chemical Change " 



