The pineal gland produces which hormone that helps regulate the sleep and wake cycle?
Correct answer: A. Melatonin
- A. Melatonin
- B. Thymosin
- C. Calcitonin
- D. Erythropoietin
Explanation
Melatonin from the pineal gland helps regulate circadian sleep and wake rhythms, especially in response to darkness. Calcitonin is produced by thyroid C cells, while erythropoietin is mainly produced by the kidneys.
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About Endocrine System
The endocrine system covers hormone-producing glands including the pituitary, thyroid, parathyroids, adrenals, pancreas, pineal gland, ovaries and testes. It explains hormone classes, target-cell responses, feedback control, and the functions of hormones such as insulin, thyroxine, cortisol, growth hormone and ADH, which is often confused with a kidney-produced substance.
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