Define vital capacity. What is its significance? |NCERT solution|Class 11 Biology|Unit-17 Breathing and exchange of gases



Q.1:- Define vital capacity. What is its significance?

 

Answer:

Vital Capacity (VC): The maximum volume of air a person can breathe in after a forceful expiration is called Vital Capacity. This is also defined as the maximum volume of air a person can breathe out after a forceful inspiration. VC = ERV + TV + IRV.



Vital capacity of a person gives important clues while diagnosing a lung disease. Measurement of this capacity helps the doctor to decide about the possible causes of the diseases and about the line of treatment.