These end in microscopic air sacs called alveoli. The process of ventilation ... Parts of the model represent different parts of the respiratory system as shown here. The model, which is air ...

Gas exchange occurs in the alveoli which are found in the lungs. Many spongy mesophyll cells are in contact with the air spaces, providing a large surface area for gas exchange to happen.

Pulmonary alveolar proteinosis (PAP) is a rare respiratory disease that ... white blood cells that are part of the immune system and found in the alveoli or ‘air sacs’ of the lungs — remove ...

However, its contribution to lower respiratory infections -those that affect the lower respiratory tract, including the lungs, bronchi and alveoli- is less well documented ... a large cohort of 7.7 ...

Long-term exposure to PM2.5, PM10, NO2 and ozone (O3) air pollution is associated with more hospital admissions for lower respiratory tract infections in adults.