Gas Exchange

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Across
  1. 2. inhalation is an ____ process
  2. 4. air enters,filtered,warmed, and moistened
  3. 5. regulates entry of air, movable flap
  4. 6. organ of the gas exchange
  5. 8. inhalation is the intake of
Down
  1. 1. sheet of muscle that forms border between chest cavity and the abdomen
  2. 3. the primary function of the respiratory system is to _____
  3. 7. inhalation takes oxygen to the