nilsacard

advancedonc 9401 Wilshire Blvd, Suite 650 Beverly Hills, CA 90212 | Call: 310-461-0300 As blood flows through the parathyroid glands, the amount of calcium and Vitamin D in the blood is checked by the parathyroid glands; if the amount of calcium or Vitamin D is low the gland produces PTH, and if the amount of calcium is high the gland stops producing PTH. Through this mechanism, there is minute-to-minute control of the level of calcium in the blood. The concentration of calcium in the blood is so important to normal functioning of the body, which is why there are four parathyroid glands, even though one gland would be enough to do the job. These glands are very active and are constantly working.