NEET MDS

The Power Course

Lung volumes and capacities pick the wrong choice



Choices

1 ) The amount of air expired during quiet breathing is tidal volume
2 ) The amount of air forcefully expired after passive inspiration is expiratory reserve volume.
3 ) The air inspired with a maximal inspiratory effort in excess of the TV is the inspiratory reserve volume
4 ) The maximum amount of air expired from the fully inflated lungs is vital capacity

Explanation


Tidal volume (TV)

The amount of air that moves into the lungs with each inspiration (or the amount that moves out with each expiration) during quiet breathing. The normal value is 500–750 mL

Inspiratory reserve volume (IRV)

The air inspired with a maximal inspiratory effort in excess of the tidal volume. The normal value is 2L

Expiratory reserve volume (ERV)

The volume of air expelled by an active expiratory effort after passive expiration. The normal value is 1L

Residual volume (RV)

The air left in the lungs after a maximal expiratory effort. The normal value is 1.3L

Total lung capacity (TLC)

This is the sum of TV, IRV, ERV, and RV. The normal value is 5L

Vital capacity (VC)

The maximum amount of air expired from the fully inflated lungs. This is the sum of TV,  IRV, and ERV. The normal value is 3.5L

Inspiratory capacity (IC)

The maximum amount of air inspired from the end-expiratory level. This is the sum of IRV, and TV. The normal value is 2.5L

Functional residual capacity (FRC)

The volume of the air remaining in the lungs after expiration of a normal breath. This is the sum of RV and ERV. The normal value is 2.5L

Forced vital capacity (FVC)

The largest amount of air that can be expired after a maximal inspiratory effort. 

FEV1 (forced expiratory volume in the first second)

The fraction of the VC expired during the first second of a forced expiration.

The FEV1 to FVC ratio (FEV1 /FVC) is a useful tool in the recognizing classes of airway disease.

Respiratory minute volume (RMV)

RMV is normally ∼6 L (500 mL/breath × 12 breaths/min)

Maximal voluntary ventilation (MVV)

The largest volume of gas that can be moved into and out of the lungs in 1 min by voluntary effort. measure over fifteen secs


Answer

The amount of air forcefully expired after passive inspiration is expiratory reserve volume.

Last Modified : 30-Dec-2019

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