Body rhythms and circadian · Physiology

Which physiological variable normally shows a circadian rhythm with a peak in the late afternoon?

  1. Body temperature
  2. Melatonin level
  3. Growth hormone secretion
  4. Prolactin secretion
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Correct answer: Body temperature

Core body temperature typically reaches its maximum in the late afternoon or early evening. It is lowest during the early morning hours.

Difficulty: Medium Question 7 of 20

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