The actions of parathyroid hormones are is antagonized by the actions of

Question

Quizplus · Accepted Answer

The actions of parathyroid hormone (PTH) are antagonized by the actions of calcitonin. PTH increases blood calcium levels by stimulating bone breakdown and calcium release, increasing calcium absorption in the gut, and decreasing calcium excretion in the kidneys. Calcitonin, on the other hand, decreases blood calcium levels by inhibiting bone breakdown and calcium release, decreasing calcium absorption in the gut, and increasing calcium excretion in the kidneys. Thus, the two hormones have opposite effects on calcium regulation. Vitamin, estradiol, and insulin do not directly affect PTH or calcitonin actions.

The Actions of Parathyroid Hormones Are Is Antagonized by the Actions