ANATOMY

Detailed explanation-1: -The nose is the only part of the respiratory system that is visible externally and is the route for air entry into the respiratory system. Air is drawn in via the nostrils or external nares and enters the large nasal cavity, which is divided into two by the nasal septum.

Detailed explanation-2: -The internal part of the nose is the nasal cavity. The two nasal cavities sit within the external nose and the adjacent skull. The cavities open anteriorly to the face through the two nares.

Detailed explanation-3: -Lateral walls (outer walls): The outer walls of your nose are made of cartilage and covered in skin. The walls form your nasal cavities and your nostrils.

Detailed explanation-4: -The NASAL CAVITY (nose) is the best entrance for outside air into your respiratory system. The hairs that line the inside wall are part of the air-cleansing system. Air can also enters through your ORAL CAVITY (mouth), especially if you have a mouth-breathing habit or your nasal passages may be temporarily blocked.