Parathyroid hormone does all of the following, except that it doesn't A) build up bone. B) enhance the reabsorption of calcium at the kidneys. C) stimulate the formation and secretion of calcitriol at the kidneys. D) stimulate osteoclast activity. E) inhibit osteoblast activity.

Question

Quizplus · Accepted Answer

Parathyroid hormone (PTH) primarily functions to increase blood calcium levels. It does this by stimulating osteoclast activity (D), enhancing calcium reabsorption in the kidneys (B), and promoting the formation of calcitriol (C), which increases intestinal calcium absorption. It also inhibits osteoblast activity (E), which would otherwise build bone. Therefore, PTH does not build up bone (A).

Parathyroid Hormone Does All of the Following, except That It