The Respiratory system

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Across
  1. 4. Gas inhaled by every human and is required for survival
  2. 6. Small tube dividing into Alveoli
Down
  1. 1. Small air passages surrounded by blood vessels
  2. 2. One of the primary organs involved in respiration
  3. 3. Located in the throat between the nose and the voice box
  4. 5. Entrance of air into your body and filters the air
  5. 7. Also known as the voice box