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Biological rhythms (periodic physiological fluctuations). Types of rhythmsUltradian (Basic Rest-Activity Cycle)Circadian (sleep-wake cycle)Infradian (menstrual cycle)Circannual (annual breeding cycles)All rhythms allow us to time events and anticipate change! . Circadian Function. Circadian (circa diem) rhythms regular bodily rhythms that occur on a 24 hour cycleInternal biological clock(s)?Pacemaker cells; cryptochrome proteins; clock genesFruit fly clock4 regulatory proteins that9447

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