Author Question: Which of the following can entrain the circadian sleep-wake cycles of animals living under constant ... (Read 89 times)

imanialler · **on:** Jun 22, 2018

Which of the following can entrain the circadian sleep-wake cycles of animals living under constant lighting conditions?

A) regular daily bouts of social interaction
B) regular daily meals
C) regular daily bouts of exercise
D) all of the above
E) none of the above

Question 2

Free-running periods of sleep-wake cycles are

A) the pauses between free-running cycles.
B) invariably lengthened by zeitgebers.
C) invariably shortened by zeitgebers.
D) usually longer than 24 hours.
E) usually shorter than 24 hours.