Core Practical
Does caffeine affect heart rate?
Introduction: -: Caffeine is the name of an alkaloid present in plants, such as coffee and tea.Caffeine is absorbed rapidly into the bloodstream from the gastro-intestinal tract. Throughout the body it increases metabolic rate by around 10%.
Caffeine has many metabolic effects. For example,
- It stimulates the central nervous system
- It releases free fatty acids from adipose (fatty) tissue
- It affects the kidneys, increasing urination, which can lead to dehydration
- Increase heart beat
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Peer Reviews
Here's what a star student thought of this essay
Quality of writing
In some instances the wrong punctuation has been used, or the wrong spelling, but this is very rare, overall spelling and punctuation okay. Wrong use of spacing in some instances, or misuse of one or two words.
Level of analysis
The level of analysis of results is good, and the discussion and then conclusion provide an accurate interpretation of the results. There could have been more scientific reasoning behind why the experiment went wrong and why the hypothesis should have been scientifically correct. They follow conventions for this level of work closely but the technical terms used are quite basic.
Response to question
Introduction is good, sets out the background to the experiment and then proposes what the experiment is trying to find out in the hypothesis. I'd like to see a bit more scientific explanation behind why the heart beat increases when exposed to caffeine rather than just stating the different effects that caffeine has. Therefore, the background could be more focused into explaining the scientific reasoning behind the experiment, as could the hypothesis. Overall body of the method is quite clear and concise and the results presented in an appropriate way. The interpretation or discussion of the results is quite clear in the meaning although correct use of commas should have been used to separate the results out more.
