Define the following terms:
$(a)$ Tidal volume
$(b)$ Residual volume
$(c)$ Asthma

(N/A) Tidal volume: It is the volume of air inspired or expired during a normal respiration. It is approximately $500 \ mL$. $A$ healthy man can inspire or expire approximately $6000$ to $8000 \ mL$ of air per minute.
$(b)$ Residual volume: The volume of air remaining in the lungs even after a forcible expiration. This averages $1100 \ mL$ to $1200 \ mL$.
$(c)$ Asthma: This is a respiratory disorder characterized by difficulty in breathing causing wheezing due to inflammation of bronchi and bronchioles.