The nasal cavity is located within and posterior to the nose and is part of the passageways of which system?

• A. Digestive
• B. Respiratory
• C. Nervous
• D. Endocrine

Answer: (B)

The nasal cavity is part of the respiratory system because its primary role is to serve as a passageway for air and condition it before it reaches the lungs. As air enters through the nose, it is warmed, humidified, and filtered by the mucous membranes and cilia, helping protect the delicate tissues of the lower respiratory tract. This setup makes it a key component of the respiratory tract, specifically the upper portion that handles air intake. It isn’t involved in digestion, which occurs in the gastrointestinal tract; nor is it part of the nervous or endocrine systems, which deal with signaling and hormone regulation, respectively.