Solve the Crossword puzzle

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Across
  1. 1. largest internal organ I the human body
  2. 4. filters the blood and remove the waste
  3. 5. Ateries,capillaries and veins are all the parts of system.
Down
  1. 2. system bring in oxygen and remove carbon dioxide
  2. 3. system supports and protects the various organs of the human body