The rental heart

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Across
  1. 3. Holder of the rental heart
  2. 6. A tube through which food passes from the mouth to the stomach
  3. 7. Something you fill with air
  4. 8. The feeling of a broken heart
  5. 9. A symbol of love
  6. 12. When something is very technically complicated
  7. 13. Instead of your real heart
Down
  1. 1. Shiny as a result of being rubbed
  2. 2. What you get in return of a undamaged heart
  3. 4. The greatest feeling in the world
  4. 5. Fresh out of the factory
  5. 10. Something that is on the rental heart
  6. 11. A German physicist
  7. 14. When the plane rolls, ready to take-off