LESSON V 

 MUSCLE AND NERVE (Continued) 



INFLUENCE OF TEMPERATURE, CHEMICALS, AND FATIGUE UPON THE 

 CONTRACTION OF MUSCLE 



1. The Influence of Changes in Temperature on Contraction. Fill 

 the outer space of the muscle chamber with cracked ice and fasten it in 

 the stand. Suspend a gastrocnemius muscle from the hook upon the 

 inner surface of its cover and connect the tendo achillis by means of a 

 long thread with a writing lever placed directly underneath the floor of 



^ J- 



FIG. 26. THE MUSCLE WAKMEB. 



An apparatus for studying the influence of temperature on muscular contraction. 



(Porter.) 



the chamber. Fasten the ends of the wires from the secondary coil in 

 the upper part of the muscle, and arrange the inductorium for stimula- 

 tion with single induction shocks. Suspend a thermometer next to the 

 muscle in the inner compartment, but in such a way that its bulb does 

 not come in contact with the metal. 



When the temperature has reached a point near zero, record a single 

 break contraction upon a rapidly revolving drum. Be sure to break 



