NEETZoologyChemical Coordination and Integration
Select the correct function with respect to the organ X in the following figure.
Options
- AX increases blood calcium level.
- BIt is present on the back of the thyroid gland.
- CThey secrete a peptide hormone called parathyroid hormone.
- DAll the above functions are correct
Correct answer
D. All the above functions are correct
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).