What are the different respiratory volumes involved in the breathing movements

The volume of air involved in the breathing movements can be measured by using a spirometer.

(i) Tidal Volume (TV)

- TheVolume of air inspired or expired during a normal respiration is called Tidal Volume.

- A healthy man can inspire or expire approximately 6000 to 8000 ml/min of air.

(ii) Inspiratory Reserve Volume (IRV)

- The extra volume of air, a person can inspire by a forcible inspiration is called as Inspiratory Reserve Volume (IRV).

- It is about 2500-3000 ml.

(iii) Expiratory Reserve Volume (ERV)

- The extra volume of air, a person can expire by a forcible expiration is called Expiratory Reserve Volume (ERV).

- It is about 1000-1100 ml.

(iv) Residual Volume (RV)

- The volume of air remaining in the lungs even after a forcible expiration is called Residual Volume (RV).

- Its value averages between 1100 ml and 1200 ml.