Insulin promotes glucose storage as glycogen

Steps:

• Insulin is a hormone that lowers blood glucose levels after meals or injection.
• It signals cells to take up glucose from the blood.
• In the liver, insulin activates enzymes for converting glucose to glycogen.
• This storage reduces circulating glucose and increases glycogen production.

Why D is correct:

• Insulin stimulates glycogen synthase enzyme, directly increasing glycogen synthesis from glucose per cellular metabolism pathways.

Why the others are wrong:

• A: Insulin does not trigger adrenaline release; adrenaline opposes insulin by raising glucose.
• B: Insulin inhibits glycogen breakdown, so less glycogen is released from the liver.
• C: Insulin decreases blood glucose by enhancing uptake and storage, not increasing it.

Final answer: D