NEURO-MUSCULAR ORGANIZATION OF SHIVERING 
2. The increased muscle tonus that occurs in anesthetized dogs 
prior to shivering is not necessarily a phenomenon of tempera- 
ture regulation origin. 
3. Lung expansion facilitates shivering. 
4. Proprioceptor activity may facilitate as well as coordinate 
shivering. 
5. Acetylcholine inhibits and epinephrine facilitates shivering, and 
suggests a relationship of shivering to the level of excitability 
of the reticular activating system. 
ACKNOWLEDGMENT 
I wish to thank Dr. A. Hemingway, Professor of Physiology, 
UCLA School of Medicine, for his help and encouragement in pre- 
senting this paper, and I also wish to extend my appreciation to Mr. 
D. Stuart for editing this paper. 
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