alleryStart learning →Melatonin, which helps regulate circadian rhythm, is secreted by which gland?
AThe pastel gland
BThe pebble gland
CThe pineal gland
DThe peanut gland
Answer & Solution
Correct answer: C. The pineal gland
1. Melatonin is derived from the amino acid tryptophan.
2. It is the hormone tied to the daily sleep and waking cycle.
3. Melatonin is secreted by the pineal gland.
4. It helps regulate circadian rhythm.
_Source: OpenStax Anatomy and Physiology 2e (CC BY 4.0), Ch 17 'The Endocrine System', sections 17.1-17.9_
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