Final answer:
The nasal cavity is the structure in the respiratory system responsible for filtering and warming the inhaled air.
Step-by-step explanation:
The structure responsible for filtering and warming inhaled air as part of the respiratory system is the nasal cavity. The nose and nasal cavity contain hairs and produce mucus which trap particles. This safeguards the lungs from foreign matter. The expansion of the surface area within the nasal passages, due to the presence of conchae and meatuses, aids in warming and humidifying air that enters the body. Therefore, the correct answer to the student's question is option 1) Nasal Cavity.