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It is known that caffeine and alcohol both have different effects on the heart rate of a human. Caffeine, as it is consumed, increases the heart rate of a person, but this is not the case for the consumption of alcohol, the heart rate slows down as a person consumes alcohol. But what most researchers wondered was, does alcohol and caffeine have the same effect on a Daphnia magna? Many researchers already know what the effect of caffeine and alcohol on the heart rate of a human is, but most of them wondered is what effect it has on the heart rate of other living organisms. It was easy to use a D. magna for this experiment, because of the transparent covering that surrounds the body. People are aware that “...caffeine stimulates the receptors within your heart to beat faster by blocking the enzyme phosphodiesterace...” (Nunley 2013) or in other words that caffeine increases your heart rate.The experiment was attempted many times, including in 2009, “results showed that when the scientist increased the amount of caffeine in the solution, the Daphnia heart rates increased” (Lamoureux 2009). Researchers knew that “alcohol...causes the heart to beat too rapidly, or irregularly” (“Interactive Body Content”). Even though researchers have conducted the experiment, it was good to repeat the experiment as it made the data more accurate. My hypothesis as I preformed the experiment was that the D. magna would be affected as much as humans are when they have consumed caffeine and alcohol. Before I started the experiment, I predicted that the D. magna’s heart rate would have increased more and more every time the experiment with caffeine was done, and that the heart rate would have decreased more and more as the experiment with alcohol was done.
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