BIOC34H3 Lecture Notes - Lecture 11: Tidal Volume, Functional Residual Capacity, Spirometry
Lung volumes: tidal volume (vt) is the volume of air inspired and expired during normal breath ~500 ml. Inspiratory capacity (ic) is the maximum amount of air that can be inspired following normal expiration. Ic = vt + irv: vital capacity (vc) is the maximum amount of air that can be expired following maximal inspiration. Feb. 12, 2018: very important in pulmonary function tests. Vc = irv + vt + erv: functional residual capacity (frc) is the amount of air remaining in the lungs following normal expiration. Frc = erv + rv: total lung capacity (tlc) is the amount of air in the lungs at the end of maximal inspiration. Tlc = irv + vt + erv + rv. Makes it harder to expire: in emphysema, damaged lung tissue from over-inflated alveoli, lungs can fill but can"t collapse into a small shape during expiration.