Alcohol And Heart Rate Experiment

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Effects of Chemicals on Heart Rates in Organisms. Jesutofunmi Bankole
El Centro College
This experiment studies the effect of caffeine and alcohol on heart rate. This lab experiment detailed how water flea, (Daphnia magna) a transparent aquatic organism whose heart can be easily identified using a compound light microscope, was used to study the effects of caffeine and alcohol on heart rates. According to the research alcohol was observed to have caused a decrease in the heart rate of Daphnia magna while caffeine caused an increase in the heart rate.

Daphnia magna is the name of a group of small aquatic crustaceans commonly called water fleas. They belong to the Phyllopoda which are
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The overall effect of alcohol and caffeine decreased or increased the heart rate of Daphnia magna. There were two or more anomalous results from the experiment, this might have been due to many faults encountered. The heartbeat of Daphnia magna became irregular at some point (Table 1) this could be due to the fact the Daphnia magna 's small mass and surface area would struggle severely to cope with the change in the environment. I noticed that when the Daphnia magna stayed in the alcohol environment for longer than the 10 seconds I timed there was a decrease in the heartrate of Daphnia magna when subjected to alcohol in comparison to when it was in distilled water. The difference between the two environments was not much. A probability that the pipette I used in transferring alcohol solution was contaminated with either distilled water or alcohol solution which led to an interruption in the Daphnia magna’s environment. Likewise when the Daphnia magna was subjected to caffeine solution, at the beginning (Table 2) there was a slight increase in the heartrate(Dixit et al) than in distilled water. This might have happened because the Daphnia magna was trying to get adjusted to its new …show more content…
These same effects can also be seen in humans.

Lesiuk, NM and Drewes, CD. 1999. Blackworms, blood vessel pulsations and drug effects. The American Biology Teacher, 61(1), 48-53 Dixit, A., Vaney, N., Thawani, R., & Goyal, A. (2012). Effect of caffeine on information processing: Evidence from stroop task. Indian Journal of Psychological Medicine, 34(3), 218-222.
Larisa, B. (2014, November 01). The CAFFEINE Buzz. Vibrant Life, (6), 36, retrieved from
Vivanco, L. "This is your body on alcohol; How heavy, binge drinking affects your organs." Chicago Tribune. 2015, January 21:

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