NEURAL AND HORMONAL FACTORS IN BODILY ACTIVITY

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Abstract
Normal cats show blood-sugar increases of 50 to over 100 % above the fasting level when caged and excited by an aggressive dog for periods of 2-4 min. Less marked hyper-glycemic responses are observed with succeeding emotive reactions. There are evidences of parallelism in the visceral and somatic expressions. If the liver is de-nervated without interference with medulliadrenal function, emotional hyperglycemia is only slightly less than in normal animals. Ablation of the adrenal medulla results, however, in marked hypoglycemia during the emotional reaction, even though hepatic innervation be kept intact. The general affective response, and also the hepatic reserves of glycogen in medulliadrenalectomized animals, were not appreciably altered from the normal. Medulliadrenal intervention appears to be of great importance in calling forth readily available fuel for muscular activities during conditions of urgency.

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