<P> In humans , the respiratory tract is the part of the anatomy of the respiratory system involved with the process of respiration . Air is breathed in through the nose or the mouth . In the nasal cavity , a layer of mucous membrane acts as a filter and traps pollutants and other harmful substances found in the air . Next , air moves into the pharynx , a passage that contains the intersection between the esophagus and the larynx . The opening of the larynx has a special flap of cartilage , the epiglottis , that opens to allow air to pass through but closes to prevent food from moving into the airway . </P>
<P> In humans , the respiratory tract is the part of the anatomy of the respiratory system involved with the process of respiration . Air is breathed in through the nose or the mouth . In the nasal cavity , a layer of mucous membrane acts as a filter and traps pollutants and other harmful substances found in the air . Next , air moves into the pharynx , a passage that contains the intersection between the esophagus and the larynx . The opening of the larynx has a special flap of cartilage , the epiglottis , that opens to allow air to pass through but closes to prevent food from moving into the airway . </P>
what are the path ways of respiratory system
what are the path ways of respiratory system
pharynx epiglottis mucous membrane esophagus larynx
pharynx epiglottis mucous membrane esophagus larynx