Daphnia Experiment Report - 1504 Words

Daphnia Experiment Report 1. Introduction Caffeine is found in many plant species, where it acts as a natural pesticide. It is found most commonly in cocoa, tea and coffee, but is also artificially added to some soft drinks such as cola to act as a flavour enhancer. When consumed by humans, caffeine works as a stimulant causing amounts of released neurotransmitters to be increased. High use of caffeine has been related with raised blood pressure, restlessness, insomnia and anxiety which, in the long term, can lead to heart and circulation problems. The aim of this experiment is to observe whether caffeine has any significant effect on heart rate. To test this, daphnia will be placed in water and then caffeine solution, so the†¦show more content†¦The error bars display the range of the recorded heart rates. 6. Precision, Reliability and Validity The experiment was designed to produce reliable results to some extent. For example: * Controlled variables were put in place so that the daphnia’s heart rate could not be effected by any other factor than caffeine content and; * Four heart rates were recorded in both water and caffeine solution so that an average could be produced. However, the experiment could have been conducted in further detail to produce a more accurate set of results. Firstly, the fact that only one daphnia was tested in the experiment minimizes the results accuracy greatly. If the experiment had been carried out on more daphnia, an average of averages could have been calculated for in water and in caffeine solution. Also, only four heart rates (BPM) were recorded for each liquid, which were used to produce an average. Four records to produce an average is probably insufficient; a reasonable amount to produce an average is about ten records. Another factor that may decrease the validity of the results is that the heart rate was only counted for 20 seconds at a time and then multiplied by 3 to calculate beats per minute. This was done for ethical reasons – so that the daphnia could be placed back in it’s natural habitat as quickly as possible. This could have devaluated theShow MoreRelatedDaphnia Heart Rate and Kcl1022 Words   |  5 PagesJuanita Sarmiento Daphnia Ecotoxicology Lab Report Introduction Ecosystems have a way of maintaining themselves under ordinary conditions but when a new factor is added that will most likely threaten the environment action needs to be put forth. Our environment is affected by many pollutants on a daily bases forming a threat to natural stability. For example some of the most polluted parts of the environment are bodies of water like that explained in our lab. Once pollution occursRead MoreThe Effects Of Alcohol On The Heart Rate Of Daphnia Magna1341 Words   |  6 PagesABSTRACT This report presents the physiological changes in the heart rate of a fresh water crustacean Daphnia magna when exposed to caffeine and alcohol. Different Daphnia magnas were placed in a depression slide containing fresh water and later exposed to solutions of caffeine and alcohol. Each Daphnia magna had different responses. These data suggest there is an increase in heart rate when a Daphnia magna is exposed to caffeine and a decrease in heart rate when it is in a solution of alcohol. Read MoreDaphnia Heart Rate Experiment Essay1570 Words   |  7 PagesExperiment Report for: ‘the affect of Caffeine on Daphnia’s heartbeat’ Introduction: Aim: The aim of this experiment is to understand the affect of the drug Caffeine on the rate of a Daphnia’s heartbeat. 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