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Discuss research into the disruption of biological rhythms (eg shift work, jet lag).
(8 marks + 16 marks)

Rhythms such as the circadian sleep/wake cycle can be disrupted when people work shift patterns or
experience jet lag. The impact of the desynchronisation of internal chemical cycles, controlled by the
endogenous…

Page 2

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However, jet lag may be caused by other factors than the disruption of biological rhythms alone. An
individual may have slept badly the night before, especially due to worry of travelling (psychological
factors). Traveling itself is tiring and many holidays involve lengthy journeys which don't allow for
naps. Drinking coffee,…

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