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Caffeine is a drug that stimulates the body and causes increased amounts of stimulatory neurotransmitters to be released. At high levels of caffeine consumption it can and has been linked to restlessness, insomnia and anxiety, this therefore causes raised stress and blood pressure, thus, increasing the heart rate.

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12y ago
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13y ago

It kills them by making their hearts overwork.

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13y ago

Alcohol increased the heart rate.

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10y ago

slows down the heart - its a depressent!!

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Q: How do you think depressant would affect the heart rate of daphnia?
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