Biology crossword

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Across
  1. 3. what is the space inside a blood vessel called
  2. 4. these bring blood back from the body to the heart
  3. 5. are valves present in arteries yes or no
  4. 7. do arteries have high or low blood pressure
  5. 9. where does oxygenated blood go once its left the heart
  6. 11. these have a thick muscular wall to push blood along
  7. 12. a substance found in plasma
  8. 13. which side of the heart does the blood go through
Down
  1. 1. the only fluid tissue in the body
  2. 2. white blood cells release these
  3. 6. these are only one cell thick
  4. 8. which tissue is the heart mostly made of
  5. 10. do arteries carry oxygenated or de-oxygenated