Which gland secretes melatonin?

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Study for the AAMI Certified Associate in Biomedical Technology Exam. Study with flashcards and multiple choice questions, each question has hints and explanations. Get ready for your exam!

Multiple Choice

Which gland secretes melatonin?

Explanation:
Melatonin is the sleep-wake hormone produced by the pineal gland, a small gland deep in the brain. It rises in darkness to promote sleep and falls with light, helping regulate the body’s circadian rhythms. The pineal gland receives signals from the brain’s internal clock to vary melatonin production across the day-night cycle. The other glands mentioned have different roles—hypothalamus and pituitary coordinate hormonal release, and the thyroid produces thyroid hormones—so they do not secrete melatonin.

Melatonin is the sleep-wake hormone produced by the pineal gland, a small gland deep in the brain. It rises in darkness to promote sleep and falls with light, helping regulate the body’s circadian rhythms. The pineal gland receives signals from the brain’s internal clock to vary melatonin production across the day-night cycle. The other glands mentioned have different roles—hypothalamus and pituitary coordinate hormonal release, and the thyroid produces thyroid hormones—so they do not secrete melatonin.

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