Melatonin is released during the
A)day in diurnal species and during the night in nocturnal species.
B)day in nocturnal species and during the night in diurnal species.
C)day in both diurnal and nocturnal species.
D)night in both diurnal and nocturnal species.

Question

Melatonin is released during the 
A)day in diurnal species and during the night in nocturnal species. 
B)day in nocturnal species and during the night in diurnal species. 
C)day in both diurnal and nocturnal species. 
D)night in both diurnal and nocturnal species.

Quizplus · Accepted Answer

Melatonin is primarily released during the night in both diurnal and nocturnal species, and helps to regulate the sleep-wake cycle.

Melatonin Is Released During the