Parathyroid Glands & PTH Regulation — NEET Biology
📚 Practice ConceptIn humans, four parathyroid glands are present on the back side of the thyroid gland, one pair each in the two lobes of the thyroid gland. The parathyroid glands secrete a peptide hormone called parathyroid hormone (PTH). The secretion of PTH is regulated by the circulating levels of calcium ions.
Which of the following statements regarding parathyroid glands and their hormones are correct? S1: The parathyroid glands are embedded on the dorsal side of the thyroid gland, usually as four small structures. S2: Parathyroid Hormone (PTH) is a peptide hormone that enhances the reabsorption of calcium ions by the renal tubules. S3: PTH is a hypocalcemic hormone as it promotes bone formation and deposition of calcium. S4: Thyrocalcitonin (TCT) secreted by the thyroid gland, acts to decrease blood calcium levels by inhibiting bone resorption. S5: Along with TCT, PTH plays a significant role in maintaining the overall calcium balance in the body.
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