Can you explain how parathyroid hormone injections make bones stronger when too much parathyroid hormone made by the body weakens bones?
Parathyroid hormone (PTH) is produced by four small parathyroid glands in the neck that control how much calcium is in the blood and tissues. Calcium is necessary not only for bone health but also for normal heart, muscle and nerve function and normal blood clotting. Every day, calcium lost in urine, feces and sweat, or shed in skin, hair and nails must be replaced by calcium from food and/or calcium supplements. When there is too little calcium to make up for these normal losses, the body senses the low calcium level in the blood and tissues, and responds by releasing special hormones, including PTH. PTH breaks down or resorbs bone tissue to release calcium into the blood and tissues so that the body continues to function normally.
