What is the primary function of the upper respiratory system?
a)to move air toward the lungs...
What is the primary function of the upper respiratory system?
a)to move air toward the lungs while warming, moistening, and filtering it
b) to diffuse oxygen and carbon dioxide in and out of the cells
c) to absorb and break down nutrients after they are consumed
d) to pad the head with the air pockets to protect against brain trauma.
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