These pollutants, he continued, "can be inhaled deeply into the lung and may have the largest impact on the smallest lung airways."

The bronchospasms that characterize exercise-induced asthma refer to a contraction (or spasm) of lung airways.

An inflammation of the lung airways.

The first cough brings the mucus through the lung airways.

One pathway, the sympathetic nervous system, speeds the heart, opens lung airways, slows digestion and raises body temperature among other things.

Beta-2 agonists belong to a class of drugs known as bronchodilators that relax and expand lung airways during an asthma attack.

These drugs relax tight muscles around lung airways.

Drugs that decrease swelling and mucus production in lung airways.

Asthma, an inflammatory condition, can thicken the walls of lung airways and narrow air passages, a process known as remodeling.

Describes the signs and triggers of asthma, a disease of the lung airways that makes it hard to breathe.