The Respiratory System

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Across
  1. 2. A large dome-shaped muscle below the lungs and heart that separates the chest from the abdomen.
  2. 4. colorless gas that people and animals breathe out. Also made when things like wood or fuel burn.
  3. 7. The smallest airways
  4. 8. A long U-shaped tube that connects the voice box to the lungs.
  5. 10. For smelling and breathing
  6. 11. Delicate blood vessels throughout the body.
Down
  1. 1. when particles spread out.
  2. 3. One of two chest organs that provide oxygen and remove carbon dioxide.
  3. 5. What we breathe
  4. 6. Microscopic balloon-shaped structures at the end of the respiratory tree.
  5. 7. A large airway that connects the windpipe to a lung.
  6. 9. Paired bones that form the protective rib cage of the chest.