NEETZoologyChemical Coordination and Integration
Where are the parathyroid glands located?
Options
- AOn the anterior surface of the thyroid gland
- BOn the posterior surface of the thyroid gland
- COn the adrenal glands
- DNear the pancreas
Correct answer
B. On the posterior surface of the thyroid gland
Step-by-step solution
In humans, four parathyroid glands are present on the back side of the thyroid gland, one pair each in the two lobes of the thyroid gland (Figure 22.3b). The parathyroid glands secrete a peptide hormone called parathyroid hormone (PTH). The secretion of PTH is regulated by the circulating levels of calcium ions. Parathyroid hormone (PTH) increases the Ca2+ levels in the blood. PTH acts on bones and stimulates the process of bone resorption (dissolution/ demineralisation).