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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.
Confidence votes 84.8K. Calcitonin slows the release of calcium from bones into bloodstream, thereby keeping blood levels of calcium to a minimum. Parathyroid hormone does the opposite. It maintains calcium levels in the blood, or helps reabsorption of calcium from bones into bloodstream.the concentration of specific nonhormonal substances in the blood or extracellular fluid.) Calcitonin is produced by the parafollicular cells of the thyroid â¦ gland in response to rising blood calcium levels.