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Chemical Coordination and integration — BIOLOGY STD 11 Science — Question

Rajasthan BoardEnglish MediumSTD 11 ScienceBIOLOGYChemical Coordination and integration1 Mark
MCQ
A hormone responsible for normal sleep-wake cycle is:
  • A
    Epinephrine.
  • B
    Gastrin.
  • C
    Melatonin.
  • D
    Insulin.
✓

Answer

  1. Melatonin.

Explanation:

Melatonin is a hormone secreted by pineal gland. Immediately above the optic chiasma (in the brain) in a nucleus, are present melatonin receptors that react to this hormone and synchronize the nucleus to the 24 hrs day/ night rhythm, thus informing the brain when it is day and when it is night.

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