The upper respiratory tract (URT) consists of the nose, nasal cavity, pharynx, and paranasal sinuses. It undergoes a process sometimes referred to as
1. filtering.
2. warm conditioning.
3. air conditioning.
4. absorbing.
Correct Answer: 3
Rationale 1: Filtering does not occur in this process.
Rationale 2: It does not warm condition in this process.
Rationale 3: It does undergo a process referred to as "air conditioning."
Rationale 4: Absorbing does not occur in this process.
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