CPT= 5000 ml= capacitate totala
VC=500 ml= volum curent
VER= 3*500= 1500=volum expirator de rezerva
VR=1500 ml= volum rezidual
VIR= volum inspirator de rezerva
Cpt=5000, dar Cpt= VER+ VIR+VC + VR=>
5000= 1500+ vir+500+ 1500
Vir= 5000-1500-500-1500
Vir=1500 ml