pseudostratified columnar epithelium of nasal mucosa

absorption air airway anatomy bacteria biology blood bone bronchus bulb canal cartilage cavity cell chronic cilia columnar dna epiglottis epithelium gland glands hair human isolated layer lung mammal membrane mitochondria mouth mucus nasal nasopharynx nose nostrils nucleus olfactory pharynx respiratory secretion septum sinus stratified toxic trachea tract transparent vestibule