MICROANATOMY

Detailed explanation-1: -The mucous membrane lining the trachea consists of pseudostratified ciliated columnar epithelium with numerous goblet cells. The mucous produced by the goblet cells traps inhaled particles and the cilia move the mucous and particle to the larynx, from which they enter the pharynx and are swallowed or spit out.

Detailed explanation-2: -The majority of the respiratory tree, from the nasal cavity to the bronchi, is lined by pseudostratified columnar ciliated epithelium. The bronchioles are lined by simple columnar to the cuboidal epithelium, and the alveoli possess a lining of thin squamous epithelium that allows for gas exchange.

Detailed explanation-3: -The pseudostratified columnar epithelium present in the respiratory tract helps in the protection of the respiratory tract. Secretion of mucus traps these foreign particles and excretes them out of the body through sneezing or coughing. The mucus also humidifies the air that is inhaled through the nose.