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15 cards from this deck
Warms and moistens it
Filter air
Nose and mouth to larynx
Closes over trachea when swallowing to prevent food entering
Voice box
Produces sound
Windpipe
Bronchi and bronchioles
Prevent airways from collapsing
Traps dust, bacteria, and viruses
Upward current
Oesophagus where it's swallowed
In the lungs, primarily in alveoli
Reduce friction during breathing
To accommodate space for heart
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