填空题

But when hamsters in the midst of their sleep cycle were put onto an activity wheel, ______.

【参考答案】

a significant rise in serotonin levels was measured in those......

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The clock, however, can be affected by serotonin in different ways, depending on the point in the cell’s daily cycle.

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For most mammals, metabolism, hormone levels, body temperature and many other changes are not triggered by clocks.