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The secretion of parathormone is regulated mainly by the

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pituitary gland

blood Ca²⁺ levels

thyroid gland

blood glucose levels

answer is B.

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Detailed Solution

The secretion of PTH is regulated by the circulating levels of calcium ions.

Low level of Ca²⁺ in the blood stimulates the parathyroid glands to release more PTH.

PTH increases blood Ca²⁺ levels (e.g., by increasing the activity of osteoclasts).

A higher-than-normal level of calcium ions Ca²⁺ in the blood stimulates parafollicular cells of the thyroid gland to release more calcitonin which inhibits the activity of osteoclasts, thereby decreasing the blood Ca²⁺ level.

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