Liver glycogenolysis

Glucose derived from liver glycogenolysis to glucose derived from gluconeogenesis (-12 hours)... 

Liver Glycogenolysis and gluconeogenesis [alpha-1, beta-2] No parasympathetic innervation... 

C. Liver glycogenolysis is the major process for maintaining blood glucose after an overnight fast. 

During exercise, blood glucose is also maintained by liver glycogenolysis and gluconeogenesis. 

Other actions—lungs (bronchodilation), liver (glycogenolysis stimulated—T serum glucose), pancreas (-1 insulin release because a2 predominates), muscle (glycogenolysis), fat (t mobilization and use of fat). 

Epinephrine Is particularly Important In mediating the body s response to stress, such as fright or heavy exercise, when all tissues have an Increased need to catabolize glucose and fatty acids to produce ATP. These principal metabolic fuels can be supplied to the blood In seconds by the rapid breakdown of glycogen to glucose In the liver (glycogenolysis) and of tri-acylglycerols to fatty acids In adipose cells (lipolysis). 

Blood glucose concentration falls, but euglycemia is maintained by liver glycogenolysis. As exercise continues, and the blood glucose concentration falls to 4 mM, glucagon is released by the a-cells of the islets of Langerhans in the pancreas, while insulin concentration in the blood falls. The latter stimulates the mobilization of fatty acids from adipose tissue (Sec. 13.9). 

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