Circadian Rhythms

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Last updated: February 28, 2025

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Hint	Answer
body clocks are known as	endogenous pacemakers
external changes in environment that affect bio rhythms are called	exogenous zeitgebers
the process where light sets the body clock to the correct time is called	photoentrainment
what is the master circadian pacemaker (SCN) (lies just above optic chiasm)	suprachiasmatic nuclei
strongest sleep drives in early morning (AM)	2-4
strongest sleep drives in afternoon (PM)	1-3
known for his cave study in 1962 and 1972	Siffre
study in bunker where the sleep wake cycle was between 24-25 hrs	Aschoff and Wever
study where clock was sped up (day lasted 22hrs) (et al)	Folkard

Hint	Answer
Body temp is at its lowest at (AM)	4:30
At its highest at (PM)	6
small drop in body temp between (PM)	2-4
time where shift workers experience circadian trough (AM)	6
shift workers are ... times more likely to develop heart disease than those with typical work patterns	3
what is the study of how timing affects drug treatments called (eg taking aspirin last thing at night)	chronotherapeutics
who showed how much sleep/wake cycles can vary (same guy who altered circadian rhythms using artificial lighting)	Czeisler
he found they varied by (hrs)	13-65

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