A hormone secreted by the parathyroid glands when plasma calcium levels fall below the normal range; causes increased osteoclast activity, increased intestinal calcium uptake, and decreased calcium ion loss at the kidneys.
A hormone produced by the parathyroid gland (located in the neck) which regulates the amount of calcium and phosphorous in the body. If blood levels of calcium drop, parathyroid hormone promotes the release of calcium from the bones to correct the deficiency in the blood. Secretion of abnormal quantities of parathyroid hormone can lead to bone softening.
The name of the hormone that comes from the parathyroid glands. This hormone increases blood calcium. To do this, it will increase calcium absorption from the digestive tract and take calcium away from the bones and teeth. Abnormally high levels of this hormone produce a disease called Hyperparathyroidism.
A hormone that regulates calcium levels. It prevents the level of blood calcium from going too low by stimulating the breakdown of bone. In addition to triggering bone loss, it can stimulate bone formation. Given appropriately, it can increase bone mass, and is used as a treatment for osteoporosis (see Osteoporosis).
Parathyroid hormone (PTH), or parathormone, is secreted by the parathyroid glands as a polypeptide containing 84 amino acids. It acts to increase the concentration of calcium in the blood, whereas calcitonin (a hormone produced by the thyroid gland) acts to decrease calcium concentration.