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20 Cards in this Set
- Front
- Back
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Chronobiology
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Study of biological clocks and associated rhythms
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Diurnal
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Active during the day
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Nocturnal
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Active at night
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Crepuscular
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Active dawn and dusk
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Exogenous control of Biological Clock
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outside the organism (Environment)
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Period
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Time for one cycle
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Frequency
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Number of cycles per unit time
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Amplitude
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Amount of change above and below mean value
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Phase
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Point in rhythm relative to some time point in the cycle
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Zeitgeber
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"time giver" change in temperature or light
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Free running rhythms
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endogenous, without influence from environment
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Entrainment
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process of synchronizing rhythm with environmental cue
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circadian
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about a day (mimics geophysical night/day)
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circatidal
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about a tidal cycle
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circalunar
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about a month
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circannual
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about a year, seasonal migration, reproduction, hibernation
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ultraradian/infradian
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ultra- shorter than circadian; longer than circadian (infra)
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General Characteristics of Circadian Clocks
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1. Inherited
2. Temp-Independent 3. Resistant to Chemical Intervention (except alcohol) 4. Limits of entrainment 5. Independence from behavioral feedback 6. Ubiquity of circadian clocks |
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Pacemaker
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couples oscillator to output
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Biological oscillator
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self-sustained timekeeper that oscillates with period of approx 24 hrs
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