Insulin's Role in Glucose Regulation

Steps:

• Insulin promotes glucose uptake by cells for energy or storage.
• Excess insulin accelerates this uptake, rapidly lowering blood glucose levels.
• This leads to hypoglycemia, where blood glucose concentration falls below normal.
• The primary effect is reduced circulating glucose in the blood.

Why A is correct:

• Insulin facilitates glucose transport into cells via GLUT4 transporters, directly decreasing blood glucose concentration.

Why the others are wrong:

• B: Excess insulin stimulates glycogen synthesis in the liver, increasing glycogen levels.
• C: Low blood glucose prevents glucose filtration exceeding reabsorption, so no glucose in urine.
• D: Insulin activates glycogen synthase, promoting more glucose conversion to glycogen.

Final answer: A