(a) Tidal Volume(TV) is the volumeof air inspired or expired during normal breath. This is about 500 mL, i.e., a healthy man inspire or expire about 6000 to 8000 mL of air per minute. (b) Residual Volume (RV) is the volume of air remaining in the lungs even after a forcible expiration. It is about 1100 mL to 1200 mL. (c) Asthma it is a disease caused due to an allergic reaction to foreign substances. The major symptoms are difficulty in breathing causing wheezing and coughing. Due to the inflammation of branchi.
