Question

Choose the incorrect statement with respect to the hormone melatonin.

• A. Melatonin plays a very important role in the regulation of a 24-hour (diurnal) rhythm of our body.
• B. Iodine is essential for the normal rate of synthesis of melatonin in the pineal gland.
• C. It helps in maintaining the normal rhythms of the sleep-wake cycle.
• D. It influences metabolism, pigmentation, the menstrual cycle as well as our defense capability.

Answer 1

The correct option is B Iodine is essential for the normal rate of synthesis of melatonin in the pineal gland.

The hormone melatonin is synthesized by the pineal gland. It is responsible for regulating the 24-hour (diurnal) rhythm of our body, including the normal rhythms of the sleep-wake cycle. It also plays an important role in metabolism, pigmentation, menstrual cycle, and the defence capability of our body.

Iodine is essential for the synthesis of thyroxine in the thyroid gland. It has no effect on the synthesis of melatonin hormone.