Endogenous pacemakers and Exogenous Zeitgebers

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Last updated: November 6, 2023

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First submitted	October 24, 2023
Times taken	5
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