Your lungs are part of a complex system, expanding and relaxing thousands ... that end in clusters of air sacs called alveoli. These air sacs make up most of your lung tissue.

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 is a process that involves the swapping of gases that occurs at exchange surfaces such as the alveoli ... system is made from key parts, each of which has a different function.

Air pollution is a well-known risk factor for respiratory diseases such as asthma and chronic obstructive pulmonary disease (COPD).

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.