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6 years ago
Which of the following is a rhythm that tends to occur over a 90 minute period?
 
  A) a single non-REM/REM sleep cycle
  B) heart rate rhythm
  C) stomach motility rhythm
  D) smoking rhythm
  E) menstrual cycle
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wrote...
6 years ago
Answer: A
Rationale: Heart rate rhythms tend to vary over a 90 minute period.
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