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Glycogenolysis
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Diagram illustrating the biochemical pathway of glycogen breakdown in muscle, highlighting various enzyme defects that disrupt the release of energy. Blocked steps are marked with crossed lines, showing where specific enzyme deficiencies prevent normal conversion of glycogen to glucose and its metabolites, with labeled intermediates such as glucose, galactose, fructose, and lactate.
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Diagram illustrating the biochemical pathway of glycogen breakdown in muscle, highlighting various enzyme defects that disrupt the release of energy. Blocked steps are marked with crossed lines, showing where specific enzyme deficiencies prevent normal conversion of glycogen to glucose and its metabolites, with labeled intermediates such as glucose, galactose, fructose, and lactate.
enzyme defects affecting glycogen breakdown in muscle Various enzyme defects can prevent the release of energy by the normal breakdown of glycogen in muscles. Enzymes in which defects may occur include glucose-6-phosphatase (I); lysosomal x-1,4-glucosidase (II); debranching enzyme (III); branching enzyme (IV); muscle phosphorylase (V); liver phosphorylase (VI, VIII, IX, X); and muscle phosphofructokinase (VII). Enzyme defects that can give rise to other carbohydrate diseases include galactokinase (A1); galactose 1-phosphate UDP transferase (A2); fructokinase (B); aldolase (C); fructose 1,6-diphosphatase deficiency (D); pyruvate dehydrogenase complex (E); and pyruvate carboxylase (F).

Glycogenolysis

biochemistry
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Glycogenolysis, process by which glycogen, the primary carbohydrate stored in the liver and muscle cells of animals, is broken down into glucose to provide immediate energy and to maintain blood glucose levels during fasting. Glycogenolysis occurs primarily in the liver and is stimulated by the hormones glucagon and epinephrine (adrenaline). When blood glucose levels fall, as during fasting, there is an increase in glucagon secretion from the pancreas. That increase is accompanied by a concomitant...

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