In mammals, circadian rhythms rely on three separate processes: an input system that takes in information from the environment, consisting of cues such as light-dark cycles and food consumption that are received via peripheral oscillators; a central, master oscillator, or clock, that keeps track of the time of the input events and can generate a consistent rhythmic signal; and output pathways that allow the master clock to influence and synchronize the various peripheral oscillators that govern physiological operations, such as digestion, sleep-wake cycles, core body temperature, hunger, and
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how different aspect of enviorment affect circadian rhythms
