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3 August, 17:45

Our natural daily patterns of waking and sleep are called - rhythms. Exposure to daylight or darkness causes the hypothalamus to signal the - gland, which regulates the amount of - in the bloodstream, so that production of this hormone is - during daylight hours than at night.

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  1. 3 August, 18:38
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    circadian

    pineal

    melatonin

    lower

    Explanation:

    Our natural daily patterns of waking and sleep are called circadian rhythms. Exposure to daylight or darkness causes the hypothalamus to signal the pineal gland, which regulates the amount of melatonin in the bloodstream, so that production of this hormone is lower during daylight hours than at night.
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