https://www.radiologymasterclass.co.uk/tutorials/chest/chest_home_anatomy/chest_anatomy_page2
(anatomy quiz https://www.kenhub.com/en/library/anatomy/hilum-of-the-lung
two major sections: the external nose, and the nasal cavity or internal nose.
Several bones that help form the walls of the nasal cavity have air-containing spaces called the paranasal sinuses, which serve to warm and humidify incoming air.
Sinuses are lined with a mucosa.
Each paranasal sinus is named for its associated bone: frontal sinus, maxillary sinus, sphenoidal sinus, and ethmoidal sinus.
pharyngeal tonsil, also called an adenoid, is an aggregate of lymphoid reticular tissue similar to a lymph node that lies at the superior portion of the nasopharynx.
The oropharynx is a passageway for both air and food.
The oropharynx is bordered superiorly by the nasopharynx and anteriorly by the oral cavity.
A type II alveolar cell is interspersed among the type I cells and secretes pulmonary surfactant, a substance composed of phospholipids and proteins that reduces the surface tension of the alveoli.
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