A patient presents in your surgery with an inability to maintain blood sugar levels in long periods (~20 hours) between meals.
A patient presents in your surgery with an inability to maintain blood sugar levels in long
periods (~20 hours) between meals. Tests show that glucose is converted to lactate normally
in liver in the well-fed state, and that pyruvate carboxylase and phosphoenolpyruvate
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reminds you that glucagon stimulates glycogen degradation, so you administer glucagon to
the patient (who was well fed prior to the test) and find that blood sugar rises in response as
normal. What pathway is defective in this patient, and what enzyme do you suspect has a
reduced activity? Explain your reasoning.