Sleep is believed to be biologically regulated by which structure?
A) Hippocampus
B) Hypothalamus
C) Caudate nucleus and pineal glands
D) Medulla
Ans: B
Feedback:
The circadian rhythm is a pacemaker or biologic clock that regulates the daily patterning of sleep. In mammals, this structure is the suprachiasmic nucleus located in the hypothalamus. The circadian pacemaker stimulates changes in the daily patterns of sleep and wake that are endogenous (stimulated internally) to the organism.
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