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gracweeb gracweeb
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6 years ago
Acetylcholine (ACh) levels in the brain are high during _______________ sleep, but lower during ______________ sleep.
 
  a. REM; wakefulness and NREM
  b. NREM; wakefulness and REM
  c. wakefulness and REM; NREM
  d. wakefulness and NREM; REM
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xballaxballa
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6 years ago
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