Blood Glucose Homeostasis via Insulin and Glycogen Metabolism

Steps:

• Exercise uses glucose in muscles, lowering blood sugar levels.
• Low blood sugar signals pancreas to reduce insulin, allowing glycogen breakdown.
• Liver converts glycogen to glucose (glycogenolysis) to restore blood sugar.
• Eating raises blood sugar from dietary carbs; pancreas increases insulin to promote storage.
• Liver converts glucose to glycogen (glycogenesis) under insulin to lower blood sugar.

Why A is correct:

• Insulin lowers blood glucose by stimulating glycogenesis and inhibiting glycogenolysis, as per endocrine regulation principles.

Why the others are wrong:

• B: Produces more insulin during low blood sugar, which would further decrease glucose instead of raising it.
• C: Claims exercise raises blood sugar, but it actually lowers it through muscle uptake.
• D: Reverses liver actions—stores glucose (glycogenesis) when low and releases (glycogenolysis) when high, opposing homeostasis.

Final answer: A