"The airway walls are thin and flaccid, resulting in significant change in airway calibre during respiration. In inspiration, negative intra-thoracic pressure markedly enlarges the trachea. In expiration, the reversed intra-thoracic pressure causes collapse. Bronchial and tracheal diverticulosis between the cartilaginous rings, and bronchiectasis, are common 2."
"The airway walls are thin and flaccid, resulting in significant change in airway calibre during respiration. In inspiration, negative intra-thoracic pressure markedly enlarges the trachea. In expiration, the reversed intra-thoracic pressure causes collapse. Bronchial and tracheal diverticulosis between the cartilaginous rings, and bronchiectasis, are common 2."