Question

which hormone increases blood calcium levels by stimulating calcium release from bones? calcitonin adrenaline parathyroid hormone (pth) insulin

Explanation:

To solve this, we analyze each hormone:

• Calcitonin decreases blood calcium by promoting calcium deposition in bones.
• Adrenaline is involved in the "fight - or - flight" response, not calcium regulation.
• Parathyroid hormone (PTH) acts on bones to stimulate osteoclasts, which release calcium from bones into the blood, thus increasing blood calcium levels.
• Insulin regulates blood glucose levels, not calcium.

Answer:

C. Parathyroid hormone (PTH)