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Its a gas (Pharynx or throat (divided into 3 sections (nasopharynx…

- - - - uppermost section
      - beginning behind nasal cavity
      - contains lymphatic tissue called adenoids
      - air from nasal cavity passes through
    - - center section of pharynx and located behind oral or buccal cavity
    - - lowermost portion of pharynx
      - hypopharynx
      - connects to both larynx, part of RS, esohpagus and part of DS
      - both food and air passes through
- - - - inspiratory stridor
- - - - toxic if build in blood stream
- - - - conduct, move gas through system