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In Our Time BBCRadio4

Circadian Rhythms

Subscribe: http://www.bbc.co.uk/programmes/b006qykl/episodes/downloads Melvyn Bragg and his guests discuss the evolution and role of Circadian Rhythms, the so-called body clock that influences an organism's daily cycle of physical, behavioural and mental changes. The rhythms are generated within organisms and also in response to external stimuli, mainly light and darkness.

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