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Unformatted text preview: effect as epinephrine on daphnia cardiac rate. Procedure: (see attached) Discussion: As can be seen in figure 1, nicotine was found to have the greatest effect on heart rate in daphnia (mean value of 192), second was epinephrine (mean value 160.8), and lastly was caffeine (mean value 244.8). This was not completely as expected, as nicotine had a greater effect on heart rate increase than epinephrine. Nicotine results in secretion of epinephrine, so there must have been a very strong dose of nicotine. This may be partial explanation to why nicotine is so addictive, as it is a stronger “drug” than the bodies own form of epinephrine. Fig 1: effects of varying drugs on daphnia heart rate trial epinephrine caffeine nicotine 1 144 66 222 2 162 108 240 3 198 168 264 4 216 210 258 5 240 252 240 Epinephrine had a mean value of 192, caffeine : 160.8, and nicotine : 244.8....
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- Spring '08
- heart rate, Adrenal medulla