Question

Define the following terms?
a. Tidal volume
b. Residual volume
c. Asthma

Answer 1

Tidal volume :

The volume of air inspired or expired during normal breathing is known as tidal volume. Its value is approximately $500mL$.

Residual volume :

The volume of air that remains in the lungs after forceful expiration is termed as residual volume. This averages $1100mL$ to $1200mL$.

Asthma :

Asthma is an allergic disorder that is characterised by the spasms in the smooth muscles of the bronchial tubes, also called bronchial spasm, or a bronchospasm, thereby narrowing the air passageway. It results in difficult breathing, wheezing sound, coughing etc.
It occurs in some people who are hypersensitive to certain substances like pollen.