Respiratory system crossword

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Across
  1. 3. The name of the muscles between the ribs
  2. 5. The main muscle used for breathing
  3. 7. The name of the voice box
  4. 8. The smaller branches within the lungs before the tiny air sacs
Down
  1. 1. Tiny air sacs where oxygen and carbon dioxide swap
  2. 2. The bodys main organs for breathing
  3. 4. This is also known as the windpipe
  4. 6. What we breathe in and use as energy
  5. 8. The air we breathe in splits off into these 2 branches