NEETZoologyChemical Coordination and Integration
What is the role of the parathyroid glands?
Options
- AThey secrete thymosins
- BThey secrete melatonin
- CThey secrete parathyroid hormone
- DThey secrete epinephrine and norepinephrine
Correct answer
C. They secrete parathyroid hormone
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 19.3 b). 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). PTH also stimulates reabsorption of Ca2+ by