做了一下实验作文英语

做了一下实验作文英语
I recently conducted an experiment to test the effects of caffeine on the human body. My hypothesis was that caffeine would increase heart rate and blood pressure.
To conduct the experiment, I recruited 20 participants who were all between the ages of 18 and 25. Each
participant was given a cup of coffee containing 100mg of caffeine. I then measured their heart rate and blood pressure before and after consuming the coffee.
The results of the experiment were as follows: on average, the participants' heart rate increased by 10 beats per minute and their blood pressure increased by 5 mmHg after consuming the coffee. These results support my hypothesis that caffeine does indeed increase heart rate and blood pressure.
However, it is important to note that these effects were not significant enough to cause harm to the
participants. It is generally safe for healthy adults to consume up to 400mg of caffeine per day, which is equivalent to about 4 cups of coffee.
Overall, my experiment provides evidence that caffeine does have an impact on the human body, but it is important to consume it in moderation. Further research could explore the long-term effects of caffeine consumption and how it affects different age groups and populations.。