The two antagonistic hormones regulating blood calcium levels are

Question

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The two antagonistic hormones regulating blood calcium levels are parathyroid hormone (PTH) and calcitonin. PTH increases blood calcium levels by stimulating osteoclasts to break down bone tissue and release calcium into the bloodstream, stimulating the kidneys to reabsorb more calcium, and activating vitamin D to increase calcium absorption from the intestines. Calcitonin, on the other hand, lowers blood calcium levels by inhibiting osteoclast activity, decreasing calcium absorption from the intestines, and increasing calcium excretion by the kidneys. Insulin and glucagon regulate blood glucose levels, glycogen stores glucose, and ACTH and CRH are involved in regulating the adrenal gland and stress response. Glucagon is also not related to calcium homeostasis. Therefore, the only correct answer choice is D.

The Two Antagonistic Hormones Regulating Blood Calcium Levels Are