The human anatomy

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Across
  1. 1. I travel thousands of kilometers.
  2. 4. I use acid powerful enough to break down food safely.
  3. 6. I grow bigger and smaller, but I’m not a balloon.
  4. 7. I help you taste, speak, and swallow all at once.
  5. 8. I can cry without feeling sad.
Down
  1. 1. I control everything, but I have no bones or muscles.
  2. 2. I pull, never push, to help your body move.
  3. 3. I am strong as rock, yet I can repair myself.
  4. 4. I constantly fall off in tiny pieces.
  5. 5. I never rest, yet I work harder when you run.