The nasal cavity is a large, air-filled space located behind the nose. It plays a crucial role in the respiratory system by filtering, warming, and humidifying the air we breathe. The cavity is lined with a mucous membrane that traps dust, allergens, and other particles, helping to keep the lungs clean.
Additionally, the nasal cavity is involved in the sense of smell, as it contains olfactory receptors that detect odor molecules. It connects to the throat through the nasopharynx, allowing for the passage of air to the lungs and contributing to functions like speech and swallowing.