Which of the following is NOT a main function of the upper respiratory system?
gas exchange between the lungs and the blood
all are functions of the upper respiratory tract.
production of voice
transport of oxygen to the lungs
sense of smell
Ans. Gas exchange between the lungs and the blood
explaination
gas exchange between lungs and blood is done by hundreds of millions of microscopic sacs called alveoli.and alveoli consists in lower respiratory system.
upper respiratory system, or upper respiratory tract, consists of the nose and nasal cavity, the pharynx, and the larynx. The function of upper respiratory system not only provides a passage for air to be breathed in and out of the lungs, but it also heats, humidifies and filters the air and is involved in cough, swallowing and speech.
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