GENERAL HISTOLOGY

Detailed explanation-1: -Parathyroid hormone is secreted by the parathyroid glands and is the most important regulator of blood calcium levels.

Detailed explanation-2: -The parathyroid hormone (PTH), secreted by the parathyroid glands, is responsible for regulating blood calcium levels; it is released whenever blood calcium levels are low. PTH increases blood calcium levels by stimulating osteoclasts, which break down bone to release calcium into the blood stream.

Detailed explanation-3: -Calcium homeostasis is maintained by actions of hormones that regulate calcium transport in the gut, kidneys, and bone. The 3 primary hormones are parathyroid hormone (PTH) 1, 25-dihydroxyvitamin D-3 (Vitamin D3), and calcitonin.

Detailed explanation-4: -Parathyroid hormone (PTH) is a hormone that your parathyroid glands make and release to control the level of calcium in your blood by increasing it. PTH also helps control the levels of phosphorus (a mineral) and vitamin D (a hormone) in your blood and bones.

Detailed explanation-5: -While HPT occurs when one or more malfunctioning parathyroid glands produce an excess amount of PTH and raise the blood calcium level, calcitonin does not play a major role in HPT. Also, whereas calcitonin helps lower the body’s calcium levels, PTH helps increase the body’s calcium levels.