Respiratory Volumes and Capacities NEET

17.2.1 Respiratory Volumes and Capacities (NCERT) NEET/PMT-2018, 16, 10, 09, 95

  •  Tidal Volume (TV): Volume of air inspired or expired during a normal respiration. It is approx. 500 mL., i.e., a healthy man can inspire or expire approximately 6000 to 8000 mL of air per minute.
  • Inspiratory Reserve Volume (IRV): Additional volume of air, a person can inspire by a forcible inspiration. This averages 2500 mL to 3000 mL. 
  • Expiratory Reserve Volume (ERV): Additional volume of air, a person can expire by a forcible expiration. This averages 1000 mL to 1100 mL. 
  • Residual Volume (RV): Volume of air remaining in the lungs even after a forcible expiration. This averages 1100 mL to 1200 mL. 
By adding up a few respiratory volumes described above, one can derive various pulmonary capacities, which can be used in clinical diagnosis. 
  • Inspiratory Capacity (IC): Total volume of air a person can inspire after a normal expiration. This includes tidal volume and inspiratory reserve volume ( TV+IRV). 
  • Expiratory Capacity (EC): Total volume of air a person can expire after a normal inspiration. This includes tidal volume and expiratory reserve volume (TV+ERV). 
  • Functional Residual Capacity (FRC): Volume of air that will remain in the lungs after a normal expiration. This includes ERV+RV.
  • Vital Capacity (VC): The maximum volume of air a person can breathe in after a forced expiration. This includes ERV, TV and IRV or the maximum volume of air a person can breathe out after a forced inspiration. 
  • Total Lung Capacity (TLC): Total volume of air accommodated in the lungs at the end of a forced inspiration. This includes RV, ERV, TV and IRV or vital capacity + residual volume. 
         
Respiratory Volumes and Capacities
values in mL @ an average
Tidal Volume (TV)
500 mL
Inspiratory Reserve Volume (IRV)
2500 mL to 3000 mL
Expiratory Reserve Volume (ERV)
1000 mL to 1100 mL
Residual Volume (RV)
1100 mL to 1200 mL
Inspiratory Capacity (IC):
 TV+IRV = (500+3000= 3500)
Expiratory Capacity (EC):
TV+ERV = (500+1100+1600)
Functional Residual Capacity (FRC):
ERV+RV + (1100+1200= 2300)
Vital Capacity (VC):
ERV, TV and IRV = (1200+500+3000= 4700)
Total Lung Capacity
RV, ERV, TV and IRV or vital capacity + residual volume = (4700+1200= 5900)

Lung Volumes and Capacities | Owlcation




try to answer-

1. when 1500 mL air is in the lung, it is called? (1995)
2. which respiratory volume can not be estimates by spirometer? and why?
3. try to souffle the resp. volumes & capacity and their values and then rearrange it.
4. if the values in the question do not resemble to the values given in NCERT then choose the nearest one from the option for specific resp. volume and capacities. 

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