Circulatory puzzle

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Across
  1. 3. smallest blood vessels in our body
  2. 4. a muscular organ about the size of our fist
  3. 6. Most important organ in our body
  4. 7. a gas you need
  5. 8. transport oxygen,digested food and water to all parts of the body
  6. 9. another type of blood vessels
Down
  1. 1. a type of blood vessels
  2. 2. the number of times the heart beats per minute
  3. 5. biggest blood vessels in our body
  4. 6. a tube that carries blood