Vertebrate hearts

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Across
  1. 4. heart usually has right and left?
  2. 6. which blood circulation is considered large?
  3. 8. what is heart?
  4. 9. which blood circulation is considered small ?
  5. 10. where is heart located in the circulation system ?
Down
  1. 1. which liquid is heart pumping
  2. 2. what blood caries away?
  3. 3. heart of which vertebrae is the least advanced ?
  4. 5. which heart is considered the most advanced?
  5. 7. what except nutrients does blood send around body?