The document discusses lung volumes and capacities. It defines tidal volume, inspiratory reserve volume, expiratory reserve volume, and residual volume as the key lung volumes. It then defines inspiratory capacity, functional residual capacity, total lung capacity, vital capacity, and timed vital capacity as the main lung capacities by combining the relevant lung volumes. The document provides the numeric values for each volume and capacity.

1. Lung
volumes and capacities
By
Dr. Mostafa Sayed

2. Lung volumes
 Tidal volume (TV) 500 cc.
 Insp. reserve volume (IRV) 3000 cc.
 Exp. reserve volume (ERV) 1100 cc.
 Residual volume (RV) 1200 cc.

4. Lung capacities
 Insp. capacity (IC) 3500 cc = TV + IRV.
 Functional residual capacity (FRC) 2300
cc = ERV + TV.
 Total lung capacity (TLC) 5800 cc = IC +
F.R.C.
 Vital capacity (VC) 4600 cc = ERV + I.C.
 Timed vital capacity (FEV1) = 83 % of
expired air at first second i.e. the fraction
of vital capacity at first second.