Biological Rhythms 3.0 / 5 based on 1 rating ? PsychologyBiological RhythmsA2/A-levelAQA Created by: meCreated on: 28-12-13 16:30 The three types of biological rhythms circadian, infradian, ultradian 1 of 6 Circadian Occur every 24 hours E.G: sleep-wake cycle 2 of 6 Infradian Occur less frequently than once daily E.G: menstrual cycle 3 of 6 Ultradian Occur more than once daily E.G: sleep cycle (stages of sleep) 4 of 6 Endogenous Pacemakers: Internal Clock SCN acts as internal clock to keep body on 24 hour sleep-wake cycle 5 of 6 Melatonin When there is light its released thus inducing sleep and vice versa 6 of 6
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