Question

why does the respiration rate increase after exercise

Answer 1

Explanation:

1. When you exercise and muscles work harder, your body uses more oxygen and produce more carbon dioxide .
2. to cope with the extra demand, your breathing has to increase from about 15 times a minute (12liters of air) when you are resting, up to about 40 to 60 times a minute (100litters of air) during exercise

Answer 2

When you exercise and your muscles work harder, your body uses more oxygen and produces more carbon dioxide. To cope with this extra demand, your breathing has to increase from about 15 times a minute (12 litres of air) when you are resting, up to about 40–60 times a minute (100 litres of air) during exercise.