This series looks at the structure and function of the respiratory system and the oropharynx behind the mouth and the lowest section, the laryngopharynx Fig .Mouth. The mouth, also known as the oral cavity, is the secondary external opening for the respiratory tract. Most normal breathing takes place through the nasal cavity, but the oral cavity can be used to supplement or replace the nasal cavity s functions when needed..The respiratory system includes the nose, lungs and pipe like organs which connect it helps us get rid of carbon dioxide, which is a waste product of cellular function. When you breathe in, air enters your body through your nose or mouth..
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