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The Effects of Caffeine on Daphnia

Introduction:
In class we have been studying the heart, and the effects various drugs can have on it.
Caffeine is the drug taken most globally, and can cause problems including raised blood
pressure, insomnia and paranoia.
Since we are looking at the heart, we…

Page 2

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Discussion:
As you can see from the results, our experiment wasn't very successful as we didn't get to
use all the concentrations all carry out each concentration the recommended five times.
However, you can still see the definite increase in heart rate as we increased the
concentration of caffeine, except…

Page 3

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In order to improve our results, we would have to find more reliable ways to count the heart
rate of the daphnia, or use larger animals so it's easier to find out the heart rate. We would
also have to repeat the experiment more times, as well as carrying out…

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