Give the full name of PTH hormone and say briefly what it does

Parathyroid hormone plays a crucial role in regulating calcium and phosphate levels in the blood. It primarily acts to increase blood calcium levels by stimulating the release of calcium from bones, increasing calcium reabsorption in the kidneys, and promoting the activation of vitamin D, which enhances calcium absorption in the intestines. It also helps to decrease blood phosphate levels by increasing phosphate excretion in the kidneys.