Question

parathyroid hormone increases blood calcium levels by stimulating the activity of which of the following cells? osteocyte osteoblast osteoprogenitor cells osteoclast

Explanation:

Osteoclasts break down bone tissue, releasing calcium into the bloodstream. Parathyroid hormone stimulates osteoclast activity to increase blood - calcium levels. Osteocytes are mature bone cells with a role in bone maintenance, osteoblasts build bone and decrease blood - calcium levels by depositing calcium into bone, and osteoprogenitor cells are precursor cells that can differentiate into osteoblasts.

Answer:

D. Osteoclast