Zoology - Breathing and Exchange of Gases Question with Solution | TestHub

Residual volume is amount of air present in the lungs after forceful expiration. This is around 1100- 1200 ml i.e. 1.2 litres. This prevents collapse of alveoli. This is measured by helium method. This air fills in the lungs as the child breathes in for the first time. Thus assessment of residual volume can also help us to know whether the death of foetus was still birth or it died after birth.