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VMariaS [17]
3 years ago
6

Hank Greene, an airline pilot, is having difficulty with the sleep-wakefulness portions of his circadian cycle. The pineal gland

secretes the hormone , which influences this cycle.
Biology
1 answer:
d1i1m1o1n [39]3 years ago
7 0

Answer:

Melatonin

Explanation:

  • Melatonin is the hormone that is produced by the pineal gland in response to the dark and light cycle.
  • The pineal gland is turned on when there is darkness and turned off when there is light.
  • When it's dark, the pineal gland becomes active and produces melatonin leading to an increase in the melatonin levels in the blood and a person starts to feel more sleepy and the levels of melatonin remain in the blood for about 12 hours after which they fall and the state of wakefulness occurs.
  • The levels of melatonin fall sharply in the presence of bright light.
  • Thus, the melatonin hormone is responsible for controlling the sleep-wake cycle.
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