In human beings, sleep and wakefulness are regulated in part by the numerous cycles experienced each day (body temperature, hormonal activity, mental alertness, etc.). These rhythms are kept on schedule and synchronized with one another by the __.

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The Answer of In human beings, sleep and wakefulness are regulated in part by the numerous cycles experienced each day (body temperature, hormonal activity, mental alertness, etc.). These rhythms are kept on schedule and synchronized with one another by the __.

In Human Beings, Sleep and Wakefulness Are Regulated in Part