4. Primary Function is the ENDOCRINE REGULATION OF CALCIUM AND PHOSPHATE METABOLISM. Hormonal Regulation of Calcium and Phosphate metabolism Parathyroid Hormone Vitamin D Calcitonin Gastrointestinal tract No direct effect Stimulates calcium and phosphate absorption No direct effect Skeleton Stimulates calcium and phosphate resorption Stimulates calcium and phosphate transport Inhibits calcium and phosphate resorption Kidneys Stimulates calcium resorption Inhibits phosphate resorption No direct effect Inhibits calcium and phosphate resorption
5. Feedback loops involved in the regulation of serum calcium and phosphorus (PTH – parathyroid hormone; CT-calcitonin)