GENERAL HISTOLOGY

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 regulates calcium levels in the blood, largely by increasing the levels when they are too low. It does this through its actions on the kidneys, bones and intestine: Bones – parathyroid hormone stimulates the release of calcium from large calcium stores in the bones into the bloodstream.

Detailed explanation-3: -A negative feedback loop regulates the levels of PTH, with rising blood calcium levels inhibiting further release of PTH. Parathyroid hormone increases blood calcium levels when they drop too low. Conversely, calcitonin, which is released from the thyroid gland, decreases blood calcium levels when they become too high.

Detailed explanation-4: -Parathyroid glands produce parathyroid hormone, which plays a key role in the regulation of calcium levels in the blood.