circulatory crossword

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Across
  1. 2. a gas that is rich in the blood when it comes from the lungs
  2. 4. transports oxygen, digested food and water to all parts of the body
  3. 6. where respiration of air occurs
  4. 7. a muscular organ that pumps the blood in the body
Down
  1. 1. a gas that is rich in the blood when it travels from the lower body parts to the heart
  2. 3. tubes through which blood flow
  3. 5. it removed from various parts of the body by the blood