What does the nasal septum refer to?

The nasal septum refers specifically to the tissue that separates the left and right nostrils within the nasal cavity. It is primarily made of cartilage and bone, providing structure and support. This division is crucial as it helps to regulate airflow through the nostrils and maintains an optimal environment for the respiratory system by filtering and humidifying the air we breathe. The other options do not accurately define the nasal septum, as they point to different anatomical structures unrelated to the partition between the nostrils. Understanding the function and structure of the nasal septum is important for recognizing its role in respiratory health and potential medical issues related to it.