Please note there is no audio for this animation.
When you breathe, air travels in and out of your lungs through a network of tubes known as airways. The airways have an inner lining and are supported by an outer layer of muscles.
Please note there is no audio for this animation.
When you breathe, air travels in and out of your lungs through a network of tubes known as airways. The airways have an inner lining and are supported by an outer layer of muscles.