figure5.1 The secretion of a hormone be modified by can number of factors, some exerting a positive influence and others negative influence. Vander al. Himman of Body 4th ed. Copyright 1985 McGraw-Hill, Inc New York. Reprinted by permission.
Increase insulin secretion (+) whereas an increase increase in sympathetic nervous system activity (epinephrine and norepinephrine) decreases (-) insulin secretion This magnitude of inhibitory versus excitatory input determines whether there will be an increase or a decrease in the secretion of insulin