Which of the following structures or organs is NOT part of the upper respiratory system?
a. nasal conchae
b. larynx
c. pharynx
d. internal nares

b.larynx

Explanation: Larynx is an organ located at the top of the neck,its incharge of breathing,Larynx is also called the voice box. its helps in production of sound and protecting the trachea against food aspiration. The larynx houses the vocal folds, and also control high and low pitch which is essential for phonation.

It also prevents the passage of food and other foreign particles into the lower respiratory tracts.

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