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______ is a hormone produced by cells found in the thyroid gland that functions to lower blood calcium levels.

Question

BlackTom AI · Accepted Answer

Starting with the question, we’re being asked to identify the thyroid-produced hormone that lowers blood calcium levels.
Option 1: 'Thyroid hormone' (T3/T4) is primarily involved in regulating metabolism and energy use, not directly responsible for lowering calcium in the bloodstream, so this choice does not fit the description.
Option 2: 'Parathyroid hormone' increases blood calcium by acting on bones, kidneys, and the gut; it is produced by the parathyroid glands, not the thyroid, making this option incorrect in both origin and function.
Option 3: 'Calcitonin' is the hormone produced by cells in the thyroid gland (specifically the C cells) whose role includes lowering blood calcium levels by inhibiting osteoclast activity and promoting calcium deposition in bone, which aligns exactly with the prompt.
Option 4: 'Calcidiol' (25-hydroxyvitamin D) is a vitamin D metabolite involved in calcium homeostasis but is produced in the liver (and subsequently activated in the kidney), not produced by the thyroid gland, so this does not match the described source or function.
In summary, the description points to calcitonin as the thyroid-produced hormone that lowers blood calcium, while the other options either come from a different gland, perform different physiological roles, or are not thyroid-derived hormones.

Blank ______ is a hormone produced by cells found in the thyroid gland that functions to lower blood calcium levels.

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