For diffusion to occur, the following must be intact:
- Alveolar and capillary walls that are not thickened
- Interstitial space between the alveoli and capillary wall that is not enlarged or filled with fluid
[ventilation problem]
Lower airway obstruction
[ventilation example]
Asthma, airway edema
Ventilation
Process of air movement into and out of the lungs.