Human Respiratory System

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Across
  1. 1. is a windpipe that carries oxygen to the lungs.
  2. 4. the organs that block dust particles.
  3. 6. the organ that can moves down when we inhale and moves up when we exhale.
Down
  1. 2. place where oxygen enters the blood and carbon dioxide leaves the blood.
  2. 3. are two tubes that branch from the trachea and carry air into the lungs.
  3. 5. the place where oxygen and carbon dioxide are exchanged.