Biological rhythms and sleep

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Circadian rhythms
A biological rhythm that lasts 24 hours. Examples include the human sleep-waking cycle and the regulation of body temperature.
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Biological rhythms
Regular variations in physiological and behavioural processes. These are defined by the cycle length and the time between successive peaks of activity.
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Infradian rhythms
A biological rhythm that lasts more than 24 hours. Examples include the menstruation cycle, hibernation and seasonal affective disorder.
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Ultradian rhythms
Biological rhythms that last less than 24 hours. An example of this is the alternation between REM and NREM sleep during the night.
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Endogenous pacemakers
Internal body clocks that can control biological rhythms.
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Exogenous zeitgebers
Environmental stimuli that control biological rhythms (e.g.: sunlight)
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Siffre
cave study
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Suprachiasmatic nucleus
A key endogenous pacemaker within the hypothalamus that controls the pineal gland: this releases melatonin which induces sleep.
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Card 2

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Biological rhythms

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Regular variations in physiological and behavioural processes. These are defined by the cycle length and the time between successive peaks of activity.

Card 3

Front

Infradian rhythms

Back

Preview of the front of card 3

Card 4

Front

Ultradian rhythms

Back

Preview of the front of card 4

Card 5

Front

Endogenous pacemakers

Back

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