Discussion
Which one out of the following secretes the hormone called melatonin?
Answer: B
Melatonin is secreted by the pineal gland.
The pineal gland, in the brain, secretes melatonin mainly in darkness. Melatonin signals day length to the body and so regulates daily rhythms and the breeding season of seasonal breeders such as sheep, goats and horses.
The adrenal gland secretes cortisol, aldosterone and adrenaline, the pituitary its trophic hormones, and the thyroid thyroxine; none secretes melatonin.
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