Q:

Exposure to darkness leads to increased melatonin secretion. It is brought about by

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Exposure to darkness leads to increasedmelatonin secretion. It is brought about by:


  1. decreasing the activity of suprachiasmatic nucleus
  2. increasing activity of serotonin N-acyl transferase
  3. decreasing the hydroxy-indole-O-methyl transferase activity
  4. blocking the release of norepinephrine from sympathetic nerve terminals

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B. increasing activity of serotonin N-acyl transferase

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