Question: which are the principal organs of the respiratory system quizlet?
Answer: Nose (Internal & External Cavity) Produces mucus; filters, warms, and moistens incoming air; resonance chamber for speech. ... 
Paranasal Sinuses. Same as for nasal cavity except no receptors smell; also lightens skull.
Pharynx. Passageway for air and food. ... 
Larynx. ... 
Trachea. ... 
Bronchial Tree. ... 
Alveoli. ... 
Lungs.