Answer the following questions,
1. According to your data, what kind of activities increased your heart rate?
2. According to what you have learned about the circulatory and respiratory systems, explain how and why your heart
changed its rate.
2. When you are exercising, your muscles need extra oxygen. This need means that your heart starts pumping faster, which makes for a quicker pulse. Meanwhile, your lungs are also taking in more air, hence the harder breathing.
