"Airway passages" refer to the tubes or passages in our bodies that allow air to move in and out of our lungs. These passages include the nose, mouth, throat, windpipe, and bronchial tubes. Full definition
When breathed in by a susceptible dog, the viruses attach to the lining of upper airway passages where the warm, moist conditions allow them to reproduce and sicken the pet. (roverstayover.net)
In some cases, night terrors can be triggered by sleep apnea, a serious but correctable disorder in which enlarged tonsils and adenoids (normal tissue in the throat) block airway passages during sleep, making it difficult to breathe and disrupting a child's sleep throughout the night. (babycenter.com)
A humidifier or vaporizer can add moisture to a room and aid in relieving dry airway passages making breathing more comfortable, thus relieving the cough. (newkidscenter.com)