Sydney: We run our lives largely by the clock that remind us when it`s time for meals, after-school pick-up and other activities. We also have internal "clocks" and a study has found that a type of cell in the eyes are responsible for "setting" it in low light conditions. The internal clocks help set our circadian rhythms, regulating everything from our sleep-wake cycles to our appetites and hormone levels.
What`s more, the study found that rods - which take their name from their cylindrical shape - also contribute (along with cones and other retinal cells) to setting internal clocks in bright light conditions, reports the journal Nature Neuroscience. These findings are surprising for several reasons, according to study leader Samer Hattar, a biologist. "One is that it had previously been thought that circadian rhythms could only be set at relatively bright light intensities, and that didn`t turn out to be the case," he explained. "And two, we knew going in that rods `bleach`, or become ineffective, when exposed to very bright light, so it was thought that rods couldn`t be involved in setting our clocks at all in intense light. But they are," he added. IANS
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