Adrenaline triggers blood sugar rise in fear response

Steps:

• Fear activates the sympathetic nervous system, releasing stress hormones.
• Adrenaline (epinephrine) is released from adrenal glands during fright.
• Adrenaline promotes glycogen breakdown in liver to glucose.
• This glucose enters bloodstream, elevating blood sugar for energy.

Why A is correct:

• Adrenaline stimulates glycogenolysis, converting stored glycogen to glucose per the fight-or-flight mechanism.

Why the others are wrong:

• B: Carbon dioxide regulates breathing but does not affect blood sugar.
• C: Insulin lowers blood sugar by promoting glucose uptake into cells.
• D: Lactic acid forms during anaerobic respiration and has no role in raising blood sugar.

Final answer: A