The nasal cavity extends from the nostrils (nares) to what structure?

The nasal cavity is an important structure within the respiratory system that serves both respiratory and olfactory functions. It begins at the nostrils, also known as nares, and extends to the choanae, which are the openings that lead to the nasopharynx.

The choanae serve as the boundary between the nasal cavity and the pharynx, allowing for the passage of air from the nasal cavity into the respiratory tract. This connection is vital for proper airflow during breathing and for the function of the mucous membranes of the nasal cavity, which help to humidify and filter the air.

Understanding the anatomy of the nasal cavity, including its boundaries and associated structures, is essential for comprehending how air travels during respiration and the role of the nasal cavity in conditions such as sinus infections or allergy responses.