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Endogenous pacemakers and Exogenous Zeitgebers
Quiz by
jamieokeeffe726
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Last updated: November 6, 2023
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First submitted
October 24, 2023
Times taken
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Average score
4.8%
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Hint
Answer
Endogenous pacemakers
internal mechanisms that govern biological rhythms
can be altered by the environment
SCN
suprachiasmatic nucleus
obtains information about light from the optic nerve
the scn signals the pineal gland to increase melatonin at night
maintains the sleep wake cycle
Exogenous Zeitgebers
external factors that influence biological rhythms
Light
most dominant
reset the scn
indirect influence on hormone secretion and blood circulation
Social Cues
sleep patterns are based on age and daily routines
Hint
Answer
Temperature
most dominant in the absence of light
cold temperature signals reduced activity
Blended System
generally work in sync with eachother
necessary to consider these together
Evaluation
siffre supports exogenous zeitgebers
studies in the arctic
support for endogenous pacemakers
decoursey et al 2000
morgan 1995
biological reductionism
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