Question

give the pulmonary volumes and capacities

Answer 1

The tidal volume (TV), about 500 mL, is the amount of air inspired during normal, relaxed breathing.

The inspiratory reserve volume (IRV), about 3,100 mL, is the additional air that can be forcibly inhaled after the inspiration of a normal tidal volume.

The expiratory reserve volume (ERV), about 1,200 mL, is the additional air that can be forcibly exhaled after the expiration of a normal tidal volume.

Residual volume (RV), about 1,200 mL, is the volume of air still remaining in the lungs after the expiratory reserve volume is exhaled.

Summing specific lung volumes produces the following lung capacities:

The total lung capacity (TLC), about 6,000 mL, is the maximum amount of air that can fill the lungs (TLC = TV + IRV + ERV + RV).

The vital capacity (VC), about 4,800 mL, is the total amount of air that can be expired after fully inhaling (VC = TV + IRV + ERV = approximately 80 percent TLC). The value varies according to age and body size.

The inspiratory capacity (IC), about 3,600 mL, is the maximum amount of air that can be inspired (IC = TV + IRV).

The functional residual capacity (FRC), about 2,400 mL, is the amount of air remaining in the lungs after a normal expiration (FRC = RV + ERV).

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Answer 2

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Lung Volumes :

Tidal volume (T.V.) :

It is the volume of air inspired or expired during normal breathing. It is 500 ml.

Inspiratory reserve volume (IRV) :

The maximum volume of air, or the extra volume

of air, that is inspired during forced breathing

in addition to T.V. Its value is 2000 to 3000ml.

Expiratory reserve volume (ERV) :

The maximum volume of air that is expired during forced breathing after normal expiration. Its

value is 1000 to 1100ml.

Dead space (DS) :

The volume of air that is present in the respiratory tract (from nose to pthe terminal bronchioles), but not involved in gaseous exchange. It is 150 ml.

Residual volume (RV) :

The volume of air that remains in the lungs and the dead space even after maximum expiration. It is 1100 to 1200ml.

Lung capacities :

Total Lung capacity :

The maximum amount of air that the lungs can hold after a maximum forcefull inspiration (5200 to 5800ml).

Vital capacity (VC) :

The maximum amount of air that can be breathed out after a maximum inspiration. It is the some total of TV, IRV and ERV and is 4100 to 4600m

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