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Pyschological Rythms

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Across
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The biological process that displays an endogenous, entrainable oscillation of about 24 hours. Example: The sleep-wake cycle and the number of hormones secreted in a cycle.
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Disruption of the bodies normal circadian rhythm. It's caused by sleep alteration, persistent fatigue, sleep medication dependence, and mood disturbances.
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A reccurent period or cycle repeated throughout a 24 hour day. Examples: Sleeping-rem sleep, deep sleep, awake.
Down
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Each pair of small nuclei in the hypothalamus of the brain, above the optic chiasma, thought to concerned with the regulation of physiological rhythms.
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Lasts longer than 24 hours and can be weekly, monthly, or annually. It lasts longer than the circadian rhythm. Examples: Menstrual cycle and seasonal affective disorder (SAD).
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Syncronization of organisms to an external rhythm. Example: Participating in an exercise class that does aerobics to tempo music.