Answer: False
Explanation:
The parathyroid hormone is the main regulator of blood calcium levels. Calcitonin HELPS regulate blood calcium levels by going against the action of the parathyroid hormone. When blood calcium is low the parathyroid gland releases parathyroid hormone to help increase blood calcium levels. When blood calcium is too high, the thyroid hormone releases calcitonin which reduces the activity of osteoclasts consequently reducing blood calcium levels
