Chemicals can irritate the bronchial tubes, which carry air to the lungs.

This is because they are carrying the blood to and from the lungs, respectively, to be oxygenated.

The larvae then migrate through the dermis of the skin, enter the circulatory system and are carried to the lungs.

The blood carries carbon dioxide to the lungs, where it is exhaled.

It carries oxygen to the lungs and removes carbon dioxide.

In asthma, the airways that carry air to the lungs (bronchial tubes) are inflamed.

The trouble stems from chronic inflammation in the tubes that carry air to the lungs.

It is carried to the lungs and the skin, where it is excreted.

It is then carried to the lungs, coughed up, and swallowed back into the small intestine.

Health experts believe that inherited, environmental, and immune system factors combine to cause inflammation of the bronchial tubes, which carry air to the lungs.