Q. Consider the following statements regarding melatonin:
1.It is a hormone primarily secreted by the pineal gland.
2.It plays an important role in regulating circadian rhythm.
3.Exposure to bright light, especially blue light, during the night generally increases the secretion of melatonin.
How many of the above statements are correct?
Answer: B
Notes:
Explanation: 1 and 2
Statements 1 and 2 are correct: Melatonin is a hormone produced naturally by your brain’s pineal gland that regulates your internal circadian clock and sleep-wake cycle.
Statement 3 is incorrect: Exposure to bright light, particularly blue light, suppresses melatonin secretion. Melatonin levels typically rise in darkness and decline with light exposure, which is why excessive screen use before bedtime can interfere with sleep.
Source: DTE
