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Question

Which hormone is mainly responsible for regulating blood sugar levels in humans?

This question was previously asked in
RRB Technician 2026 Grade 3 Question Paper (7-Oct-2026) (Shift 3)
The correct answer is

Insulin

Insulin is secreted by the beta cells of the islets of Langerhans in the pancreas. When blood glucose rises after a meal, insulin helps body cells take up glucose and promotes its storage as glycogen in the liver and muscles, lowering blood sugar.

Deficiency or poor action of insulin causes diabetes mellitus, in which blood sugar remains high, showing that insulin is the main regulator of blood sugar.

Adrenaline prepares the body for emergencies (fight or flight) and only temporarily raises blood sugar; growth hormone controls growth of bones and tissues; thyroxine regulates the basal metabolic rate.

Hence, Insulin.

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