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The main function of insulin in the human body is to regulate blood sugar levels by facilitating the uptake of glucose into cells for energy production.
Why not the other options?
(A) To maintain blood pressure: Blood pressure regulation involves various factors, including hormones like adrenaline and systems such as the renin-angiotensin-aldosterone system, but insulin is not directly responsible for this function.
(B) To check the level of iodine in the body: Iodine levels are primarily regulated by thyroid hormones and dietary intake, not by insulin.
(C) To help in digestion of food: Digestion involves enzymes and other hormones, but insulin's primary role is in glucose metabolism, not the breakdown of food.
Therefore, the correct answer is (D) to control the level of sugar in the body.
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