Complete the missing terms:
$(a)$ Inspiratory Capacity $(IC) = \dots \dots + IRV$
$(b)$ $\dots \dots = TV + ERV$
$(c)$ Functional Residual Capacity $(FRC) = ERV + \dots \dots$

(N/A) Inspiratory Capacity $(IC) = TV + IRV$
$(b)$ Expiratory Capacity $(EC) = TV + ERV$
$(c)$ Functional Residual Capacity $(FRC) = ERV + RV$
Explanation:
$1.$ Inspiratory Capacity $(IC)$ is the total volume of air a person can inspire after a normal expiration. This includes Tidal Volume $(TV)$ and Inspiratory Reserve Volume $(IRV)$.
$2.$ Expiratory Capacity $(EC)$ is the total volume of air a person can expire after a normal inspiration. This includes Tidal Volume $(TV)$ and Expiratory Reserve Volume $(ERV)$.
$3.$ Functional Residual Capacity $(FRC)$ is the volume of air that will remain in the lungs after a normal expiration. This includes Expiratory Reserve Volume $(ERV)$ and Residual Volume $(RV)$.