SC 1-The Effect of Caffeine on Reactions Variables 1. Sugar taken 2. Exercise 3. Activity 4. Food taken 5. Pulse Prediction I will be investigating the pulse before and after taking coke, which contains caffeine. I predict that as you take caffeine it will speed up your reactions. I think this will happen because caffeine is a stimulant. This drug increases the blood pressure and stimulates the central nervous system, this also stimulates the action of the heart and lungs. …showed first 75 words of 755 total…

…showed last 75 words of 755 total…a screen and amounts of caffeine can be easily measured. It can tell us how fast it can react n how much is needed. The results that I have is enough to be certain because most of them follow the same pattern, this also indicates that it is quite accurate. There was also a control experiment, this also proves my prediction right, because decaffeinated coke was used and this actually slowed down the pulse rate.