Which is true about the interaction between the upper respiratory system and respiration?

The upper respiratory tract, including the nose and throat, filters, warms, and moves incoming air toward the lower respiratory tract. Gas exchange then occurs in the lungs, especially in the alveoli, where oxygen enters the blood and carbon dioxide leaves it. Therefore, the true statement is that the upper respiratory tract brings air to the lower respiratory tract so gas exchange can occur in the lungs.

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