Physiology The function of which of the following is increased by an elevated parathyroid hormone concentration: A Osteoclasts B Hepatic formation of 25-hydroxycholecalciferol C Phosphate reabsorptive pathways in the renal tubules D Action of osteoblasts only 💡 Explanation The function of which of the following is increased by an elevated parathyroid hormone concentration: ✓ Correct Answer: A. Osteoclasts