The regulation of how much calcium is reabsorbed occurs in the ascending limb of the loop of henle, the distal tubule and collecting ducts. [[Calcium Homeostasis - Anatomy & Physiology #Parathyroid Hormone (PTH)| Parathyroid hormone]] stimulates reabsorption. It is normal for a 1-2% excretion of calcium to occur | The regulation of how much calcium is reabsorbed occurs in the ascending limb of the loop of henle, the distal tubule and collecting ducts. [[Calcium Homeostasis - Anatomy & Physiology #Parathyroid Hormone (PTH)| Parathyroid hormone]] stimulates reabsorption. It is normal for a 1-2% excretion of calcium to occur |