| Inspiratory reserve volume $(IRV)$ | Expiratory reserve volume $(ERV)$ |
|---|---|
| $(1)$ Additional volume of air,a person can inspire by a forcible inspiration. | $(1)$ Additional volume of air,a person can expire by a forcible expiration. |
| $(2)$ Average volume is $2500 \; ml$ to $3000 \; ml$. | $(2)$ Average volume is $1000 \; ml$ to $1100 \; ml$. |
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