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However, parathyroid hormone and calcitonin work together to control calcium levels in the blood. The blood calcium level is the main stimulus for the release of these hormones, as the release of these hormones is not controlled by the pituitary.
Parathyroid hormone is released from the parathyroid glands, and calcitonin is released from the thyroid gland. If blood calcium concentration is high, calcitonin is released.alcitonin activates osteoblasts and causes calcium to be deposited in bone and thus removed from the blood, restoring normal concentration levels. Parathyroid hormone is released when blood calcium concentration is too low.