1. Parathyroid glands are located on the back side of the thyroid gland.
2. There are two pairs of parathyroid glands. One pair of parathyroid is in each lobe of thyroid.
3. Parathyroid glands secrete a peptide hormone known as parathromone or parathyroid hormone (PTH).
4. The level of Ca++ in the blood regulates the secretion of PTH.
5. PTH is hypercalcemic hormone, it increases blood calcium level. Thus the calcium balance is maintained by TCT and PTH.