Which of these is not a major function of the respiratory system?
a. it aids in the sense of smell.
b. it warms and moistens the incoming air and removes particulate matter.
c. it provides a huge surface area for gas exchange between the tissue cells and the blood.
c. it provides a pathway for the movement of air from outside the body to the surface where gas exchange takes place between the air in the lungs and the blood in the pulmonary capillaries.

A. It aids in the sense of smell

Explanation:

Among the main functions of the respiratory system are the obtaining of the oxygen from the external environment and give it to the cells. Also it is in charge of eliminating from the body the carbon dioxide produced by the celular metabolism. Those are the main functions.

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