An experiment to determine the effect of caffeine on heart rate essay

Furthermore the heart rate of some shrimp could be distinctly different from the other shrimps as they were trying to escape the cotton fibres which requires more energy thus hear rate increases. There were also cases where the heart rate was taken at a later time as I was unaware that the time limit had been reached.

effect of caffeine on heart rate lab report

Limitations that were faced during this experiment included the measurement of the heart beat. It is also to be noted that the period of time for which the daphnia is left in the solution can be controlled by the implementation of a stop watch to time all procedural occurrences throughout the investigation.

Validity Systematic errors could have caused this for example I did not give time for the Daphnia to absorb the solution before counting the heart rate. Therefore, as previously mentioned the cavity slides upon which the daphnia will be placed are to be cooled to prevent the above occurrence, also the heat lamp will only be turned on for minute intervals during which the heart rate of the daphnia will be recorded.

Effect of caffeine on daphnia heart rate results

As caffeine is a stimulant, a prediction was made that caffeine would increase the heart rate of the Daphnia. From what information I have collected I predict that the pulse rate of the people drinking the caffeinated drinks will have an increased pulse, because as research shows, caffeine is a stimulant. Variables: The independent variable that we change. How to cite this page Choose cite format:. The variability in the other contents are at caffeinated coffee and decaffeinated coffee This could perhaps be the effect of other chemicals in caffeine which Daphnia are responsive to. Drink this volume of Bison and start the stopwatch. The dependant variable is the heart rate of the shrimp will be measured over 10 seconds Ccontrol variables: These are variables that should be kept the same. Photosynthisis is the way in which light and carbon-dioxide is used by a plant to produce energy in the form of starch. The experiment was carried out as a blind trial whereby the solutions except for the control are unknown. Prediction: I predict that caffeine will increase the heart rate of the shrimp. After an initial reading of bpm, this individual dropped to a heart rate of 66 bpm. This process leaves behind the water insoluble portions of the tea bag. Research has shown us that caffeine on average takes around 45 minutes to enter the blood stream, so we cannot be certain our results were due to the effects of caffeine.

I tested each particular concentration of caffeine 10 times. I also think after a certain period of time, when the caffeine has left the persons system that the heart rate will lower again.

This suggests that the culture of Daphnia used in the experiment could have contained shrimp that are different age and size.

An experiment to determine the effect of caffeine on heart rate essay

This is needed as the objective is to investigate the effects of caffeine content. I also think after a certain period of time, when the caffeine has left the persons system that the heart rate will lower again. The data from shrimp placed in solution A caffeinated coffee has the greatest variation in results at compared to solution B, Cotton wool has also been implemented into the method to guarantee that the water flea does not simply swim off the edge of the cavity slide and die. It should be noted, however, that Individual 6 who registered a decrease in diastolic blood pressure spent a majority of the time with her head on the table after ingesting caffeine. Preliminary experiment I did a preliminary experiment to familiarise myself with the methods so no time is wasted during the actual experiment. The experiment was carried out as a blind trial whereby the solutions except for the control are unknown. Get Essay This should give us a developed idea to the effects of caffeine. In addition to this, the distance of the heat lamp from the microscope will also remain continuous as neither apparatus will be moved or altered in any way for each new test. The organism is transparent this key feature is ideal for a model organism.

The experiment was conducted by inducing the species Daphnia magna to both caffeine and ethanol, while being compared to a controlled group. Furthermore, a blind study will be conducted where the individual who determines the heart beats of the daphnia will remain unaware of the concentration in which the organism is currently submerged.

More essays like this:. The Rate of Diffusion and Osmosis of Various Solut Essay Words 3 Pages ions With Distilled Wateras an Ambient EnvironmentThroughout the process of the experiment, various concentrations of asolution of Sucrose and Water were placed into hydrolysis tubing and placedinto and ambient environment of sterile water.

Therefor the prediction of an increased heart rate when caffeine enters the blood stream seems reliable.

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Grade 12 Biology Caffeine Lab