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An investigation into how alcohol and caffeine affect the heart In this investigation I am going to investigate how alcohol and caffeine affect the heart. Because it is not easy to conduct experiments into the effect of these substances on humans, I will conduct experiments using a daphnia to find out what effect the substances have on the heart. Although humans and daphnia are very different organisms, the effect that alcohol and caffeine have on the heart should be similar. Hypothesis and Background information Hypothesis The hypothesis that I am going to test during this investigation is: Increasing the concentration of caffeine (a stimulant) solution in which a daphnia is immersed will cause its heart rate to increase, whilst increasing the concentration of alcohol (a depressant) solution in which it is immersed will cause its heart rate to decrease. Background information In this investigation I am going to investigate how alcohol and caffeine affect the...

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