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"The effect of caffeine on heart rate" Question: Does the amount of caffeine affect on your heart beat? Pre-test: Before I start my test I have found the number of heart beats of Daphnia before introducing the caffeine and after introducing the caffeine. As the graph shows when we introduced the caffeine to it, its hearth beats increased and after 7 minute it starts to falling down to normal. Prediction: Yes, it does. Caffeine is known as being a drug so as the amount of caffeine increases the hearth beat increase as well. Scientific Reasons: Coke contains caffeine. Caffeine is a drug that stimulates the nervous system which causes the hearth rate to increase. Boys are generally bigger than girls so giving the same amount of caffeine to them has less effect compared to girls. Caffeine causes increased amount of stimulatory neurotransmitters to be released. Also caffeine affects females differently. They not only have a greater sensitivity to caffeine...

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