ANATOMY

Detailed explanation-1: -Parathyroid hormone (PTH) is a hormone your parathyroid glands release to control calcium levels in your blood. It also controls phosphorus and vitamin D levels. If your body has too much or too little parathyroid hormone, it can cause symptoms related to abnormal blood calcium levels.

Detailed explanation-2: -Parathyroid hormone decreases phosphate reabsorption at the proximal convoluted tubule. Phosphate ions in the serum form salts with calcium that are insoluble, resulting in decreased plasma calcium. The reduction of phosphate ions, therefore, results in more ionized calcium in the blood.

Detailed explanation-3: -Parathormone: It is a hormone secreted by the parathyroid gland. It regulates the amount of calcium by keeping a balance between calcium in our bones and the extracellular fluid. It also regulates the excretion of phosphates in our urine.

Detailed explanation-4: -In the bone, PTH stimulates the release of calcium into the extracellular fluid by increasing osteoclastic bone resorption. In addition to its effects on calcium, PTH is one of the best characterized hormonal regulators of plasma phosphate concentration.