Circulatory system Crossword

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Across
  1. 1. the only organ in the circulatory system
  2. 4. blood in tissues
  3. 5. in lungs it is incorporated
  4. 6. transport blood and nutrients in direction of te heart
Down
  1. 2. transport oxygen-rich blood away from heart
  2. 3. open and close for the blood to flow in one direction
  3. 4. in lungs it is expulsed