194 MUSCLE AND NERVE 



What distinguishes between an electrical current and a nerve impulse? 



Give proof that conduction may pass in all directions in protoplasm. 



Give rates of conduction in various tissues. 



What factors affect conductivity? 



What are the lengths of the conduction waves in muscle and nerve? 



Discuss thoroughly the nature of a nerve impulse. 



Describe a typical degeneration and regeneration of a nerve fiber. 



By what method are muscle movements studied? 



Describe a simple myogram. 



What is the latent period of the motor end plates? 



Discuss the introductory contractions, staircase contractions, and fatigue. 



What is the cause of contracture? 



What factors cause tetanus? 



What is the nature of voluntary contractions? 



Discuss the reasons for thinking voluntary contractions tetani. 



How is the chemical energy of muscle liberated? 



What proportion appears as mechanical energy? 



Upon what factors does the work of a muscle depend? 



How is work estimated? 



What is absolute muscular force? Give its value in frog's muscle. 



How is the beat liberated by tissue measured? 



How is the electricity liberated by tissue measured? 



When are muscles iso-electric? 



What is a current of rest? Trace its path. 



What are currents of action? 



What causes a negative variation? 



Explain secondary tetanus. 



Explain why a current of action is diphasic. 



Discuss electrotonic currents. 



How does rigor mortis manifest itself? 



In what order does it affect the various portions of the body? 



What is the cause of rigor mortis? 



What is the cause of rigor caloris? 



What factors influence the onset of ri^or? 



Give the chemistry of muscle and nerve. 



