respiratory pathway

nares

where air enters the nose

vestibule

after the air enters the nose

nasal cavity

after the air enters the vestibule

nasopharynx

after the air enters the nasal cavity

oropharynx

after the air enters the nasopharynx

laryngopharynx

after the air enters the oropharynx

larynx

after the air enters the laryngopharynx

trachea

after the air enters the larynx

primary bronchi

after the air enters the trachea

secondary bronchi

after the air enters the primary bronchi

tertiary bronchi

after the air enters the secondary bronchi

bronchioles

after the air enters the tertiary bronchi

terminal bronchioles

after the air enters the bronchioles

alveolar ducts

after the air enters the terminal bronchioles

alveolar sacs

after the air enters the alveolar ducts

capillaries

after the air enters the alveolar sacs and exchanges gas here