The suprachiasmatic nucleus controls circadian rhythms via
A) indirect neural connections with the hippocampus.
B) release of hormones from the pituitary.
C) activation of the ganglion cells of the retina.
D) secretion of as yet unidentified chemicals.
E) pathways routed through the paraventricular hypothalamus.
Answer: D
Rationale: The suprachiasmatic nucleus controls circadian rhythms via secretion of as yet unidentified chemicals.
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