Physiology · Endocrine System · Easy
Melatonin
Meaning: A hormone made by the pineal gland in darkness that helps regulate the sleep-wake cycle.
In practice: Melatonin is sometimes prescribed to help children with autism get to sleep.
Quick check
Two questions on related physiology words.
Which word means: A small protein-like molecule released by nerve cells to influence the activity of other nerve cells.
Answer: Neuropeptide
Which word means: The control of heart rate, increased or decreased by nerves, hormones or drugs.
Answer: Chronotropy
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