Respiratory System

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Across
  1. 2. The part that connects (1 down) to (7 down)
  2. 5. Surrounds itself around (8 down) for gaseous exchange
  3. 9. Muscle that (7 down) rests on
  4. 10. Part of the skeletal system that protects (7 down)
  5. 11. Substance which our body removes
Down
  1. 1. A warm and moist part where air enters and leaves
  2. 3. The act of breathing in
  3. 4. The act of breathing out
  4. 6. Substance which our body needs to function
  5. 7. The part where gaseous exchange occurs
  6. 8. Tiny parts in (7 down) where it is surrounded by (5 across)