The graph illustrates the amount of air expelled rapidly and forcefully after a deep inhalation for three different people, X, Y and Z. What is one possible reason for the differences in the amounts of air expelled by these people that are shown?
- Achronic bronchitis: X, emphysema: Z, normal lung function: Y
- Bchronic bronchitis: Y, emphysema: X, normal lung function: Z
- Cchronic bronchitis: Y, emphysema: Z, normal lung function: X
- Dchronic bronchitis: Z, emphysema: Y, normal lung function: X