Bone cells are "target organs" for both calcitonin and parathyroid hormone.

Question

Quizplus · Accepted Answer

Both calcitonin and parathyroid hormone regulate the levels of calcium in the blood by acting on bone cells, among other organs. Calcitonin reduces the activity of osteoclasts, which are bone cells that resorb or break down bone tissue, whereas parathyroid hormone stimulates their activity. In this way, both hormones influence the turnover of calcium in bone tissue and its release into the bloodstream.

Bone Cells Are "Target Organs" for Both Calcitonin and Parathyroid