Insulin's role in blood sugar regulation

Steps:

• Observe graph: Blood sugar rises after eating, then falls over time without exercise.
• Identify regulator: Pancreas detects high blood sugar and releases insulin.
• Explain mechanism: Insulin signals cells to absorb glucose, converting excess to glycogen in liver and muscles.
• Match to choices: Select option describing pancreas producing insulin for glucose conversion.

Why C is correct:

• Insulin, produced by the pancreas, lowers blood glucose by promoting conversion of excess sugar to glycogen, per endocrine regulation principles.

Why the others are wrong:

• A: Incomplete and vague; pancreas regulates via hormones, not unspecified X and Y.
• B: Liver stores glycogen but does not produce insulin; that's the pancreas's role.
• D: Liver produces glycogen from glucose under insulin, not glucagon; glucagon raises blood sugar by breaking down glycogen.

Final answer: C