NEETZoologyChemical Coordination and Integration
Which of the following is a correctly matched pairing of a hormone, its source gland, and its specific physiological function?
Options
- AThymosin : Thymus : Promotes production of antibodies to provide cell-mediated immunity
- BThyrocalcitonin (TCT) : Parathyroid gland : Lowers blood calcium levels
- CParathyroid hormone (PTH) : Thyroid gland : Increases blood calcium levels
- DMelatonin : Pineal gland : Regulates the 24-hour diurnal rhythm of the body
Correct answer
D. Melatonin : Pineal gland : Regulates the 24-hour diurnal rhythm of the body
Step-by-step solution
Melatonin is secreted by the pineal gland and plays a very important role in the regulation of a 24-hour (diurnal) rhythm of our body. The other options are incorrect because: - Thymosin (from the thymus) promotes the differentiation of T-lymphocytes for cell-mediated immunity, and promotes the production of antibodies for humoral immunity. The option incorrectly links antibodies to cell-mediated immunity. - Thyrocalcitonin (TCT) lowers blood calcium levels but is secreted by the thyroid gland, not the parathyroid