Define the following terms
a. Tidal volume
b. Residual volume
c. Asthma
(a) Tidal volume is the volume of air inspired or expired under normal breathing. A normal individual has a TV of 500 mL.
(b) Residual volume is the volume of air remaining in the lungs even after a forceful expiration. A normal individual has an RV of 1100 to 1200 mL.
(c) Asthma is the difficulty in breathing due to inflammation of the bronchi or bronchioles.