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**Nasopharynx**: ONLY AIR PASSAGEWAY, soft palate, pharyngeal tonsils, top
**Oropharynx**:FOOD AND AIR PASSAGEWAY, epiglottis, palatine tonsils, lingual tonsils, middle
**Laryngopharynx**: FOOD AND AIR PASSAGEWAY, extend to larynx, bottom
Pulmonary ventilation: aka breathing, air movement in and out of our lungs
External respiration: the exchange of both O2 and CO2 between lungs/blood
Transport: O2 and CO2
Internal respiration: the exchange of ^ and ^^ in systemic blood vessels/tissues
:black_flag: Conducting zone structures: main bronchus branch to lobar (secondary bronchi), then to segmental (tertiary) bronchi, all decrease in size
:white_flag: Respiratory zone structures: feed respiratory bronchioles, then to alveolar ducts, and then to alveolar sacs
:checkered_flag: Anatomy of Lungs: root, costal surface, apex, base, hilum, left lung, and right lung
:bulb:3 layers: mucosa (cilated pseudostratified epithelium w/ goblet cells), submucosa (connective tissue), adventitia (outermost layer w/ connective tissue)
**9 hyaline cartilages**: Thyroid cartilage, cricoid cartilage, paired arytenoid catilages, paired cuneiform cartilage, paired corniculate cartilage, and epligottis (vocal folds, vocal ligaments, glottis, vestibular folds)
