Problem

Write a one-sentence explanation for each of the following statements.(a) In liver, glucag...

Write a one-sentence explanation for each of the following statements.

(a) In liver, glucagon stimulates glycogen breakdown via cyclic AMP. Although one might expect glucagon also to stimulate catabolism of the glucose formed, glucagon inhibits glycolysis and stimulates gluconeogenesis in liver.


 (b) An individual with a glucose-6-phosphatase deficiency suffers from chronic hypoglycemia.


 (c) The action of phosphorylase kinase simultaneously activates glycogen breakdown and inhibits glycogen synthesis.


 (d) The presence in liver of glucose-6-phosphatase is essential to the function of the liver in synthesizing glucose for use by other tissues.

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Solutions For Problems in Chapter 12