Which statement is true of the periaqueductal gray matter?

A. The periaqueductal gray matter is located within the tectum.
B. The term periaqueductal means "tiny ventricle."
C. The periaqueductal gray matter is involved in the control of sleep and arousal.
D. Opiates stimulate periaqueductal gray matter receptors to diminish pain.


Answer: D

Psychology

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