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Exercise and Respiration Investigation
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Exercise and Respiration Investigation
📚 Part 1: Multiple Choice
1. What happens to your heart rate when you exercise?
It decreases
It increases
It stays the same
It stops completely
2. Which equation represents aerobic respiration?
glucose + oxygen → carbon dioxide + water + energy
glucose → carbon dioxide + alcohol + energy
carbon dioxide + water → glucose + oxygen
oxygen + water → glucose + carbon dioxide
3. Which of these happen during exercise? (Select all that apply)
Breathing rate increases
Heart rate increases
More oxygen is needed by muscles
Less carbon dioxide is produced
4. Why does your breathing rate increase during exercise?
To take in more oxygen and remove more carbon dioxide
To cool down the body
To make more noise
To slow down the heart
📊 Part 2: Data Analysis
5. Complete the table below with your investigation results:
Heart Rate (beats per minute)
At rest: _________ bpm
After 1 minute of exercise: _________ bpm
After 2 minutes of exercise: _________ bpm
After 5 minutes of rest: _________ bpm
6. Look at the data you collected. Describe the pattern you observe in heart rate during and after exercise:
7. Calculate the percentage increase in heart rate from rest to after 2 minutes of exercise. Show your working:
✏️ Part 3: Understanding and Application
8. Explain why muscles need more oxygen during exercise:
9. During exercise, your body temperature rises. How does increased breathing help to cool you down?
10. A student's heart rate was 70 bpm at rest and 140 bpm after exercise. How long would you expect it to take to return to normal? Explain your reasoning:
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