PSYC 4320 FINAL EXAM 2025
QUESTIONS AND ANSWERS
What is the term for year-long rhythms that are internally generated? - ANS Endogenous
Circannual Rhythms
Endogenous Circadian Rhythms - ANS Self-generated rhythms that lasts about a day.
True of false: Circadian rhythms affect only the wake/sleep cycle - ANS False. Circadian
rhythms affect eating and drinking, hormone secretion, metabolism, etc.
At what point in the day is your body temperature highest? Lowest? - ANS Highest: late
afternoon (6 hours before sleep)
Lowest: 2 hours after sleep onset (night)
When do humans experience their most pleasant mood? Least? - ANS Most: late afternoon
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,Least: early morning
Mood increases from time of wake through the late afternoon and then decreases slightly until
bedtime.
Zeitgeber - ANS Translates to "time-giver," this is a stimulus which resets the circadian
rhythm.
True of false: without something to reset your circadian rhythm, it would gradually drift away
for the correct time. - ANS True
What is the dominant zeitgeber for land animals? - ANS Light
Are social stimuli effective or ineffective zeitgebers? - ANS Ineffective unless they induce
vigorous activity.
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, Which is an easier transition, traveling west or traveling east? - ANS West; this is known as
phase-delay.
What is the best way to adjust to working night shifts? - ANS Sleep during the day under as
much darkness as possible; work under very bright lights.
True or false: The circadian rhythm remains surprisingly steady despite external stimuli. -
ANS True. The biological clock is insensitive to most forms of interference.
What is the main driver of rhythms for sleep and body temperature? - ANS The
suprachiasmatic nucleus (SCN) of the hypothalamus.
After damage to the SCN, the body's rhythms become erratic.
How does the SCN produce circadian rhythms?
3 Copyright ©2025 FYNDLAY ALL RIGHTS RESERVED.
QUESTIONS AND ANSWERS
What is the term for year-long rhythms that are internally generated? - ANS Endogenous
Circannual Rhythms
Endogenous Circadian Rhythms - ANS Self-generated rhythms that lasts about a day.
True of false: Circadian rhythms affect only the wake/sleep cycle - ANS False. Circadian
rhythms affect eating and drinking, hormone secretion, metabolism, etc.
At what point in the day is your body temperature highest? Lowest? - ANS Highest: late
afternoon (6 hours before sleep)
Lowest: 2 hours after sleep onset (night)
When do humans experience their most pleasant mood? Least? - ANS Most: late afternoon
1 Copyright ©2025 FYNDLAY ALL RIGHTS RESERVED.
,Least: early morning
Mood increases from time of wake through the late afternoon and then decreases slightly until
bedtime.
Zeitgeber - ANS Translates to "time-giver," this is a stimulus which resets the circadian
rhythm.
True of false: without something to reset your circadian rhythm, it would gradually drift away
for the correct time. - ANS True
What is the dominant zeitgeber for land animals? - ANS Light
Are social stimuli effective or ineffective zeitgebers? - ANS Ineffective unless they induce
vigorous activity.
2 Copyright ©2025 FYNDLAY ALL RIGHTS RESERVED.
, Which is an easier transition, traveling west or traveling east? - ANS West; this is known as
phase-delay.
What is the best way to adjust to working night shifts? - ANS Sleep during the day under as
much darkness as possible; work under very bright lights.
True or false: The circadian rhythm remains surprisingly steady despite external stimuli. -
ANS True. The biological clock is insensitive to most forms of interference.
What is the main driver of rhythms for sleep and body temperature? - ANS The
suprachiasmatic nucleus (SCN) of the hypothalamus.
After damage to the SCN, the body's rhythms become erratic.
How does the SCN produce circadian rhythms?
3 Copyright ©2025 FYNDLAY ALL RIGHTS RESERVED.
