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General Medicine General f24443a7

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

A
Decreasing the activity of suprachiasmatic nuclei
B
Increasing the serotonin N-acetyl transferase.
C
Decreasing the hydroxy-indole-o-methyl transferase, activity
D
Blocking the release of norepinephrine from sympathetic nerve terminals

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