Science Crossword

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Across
  1. 6. blood blood that contains CO2
  2. 9. middle area of the kidney
  3. 12. muscle ring of muscle around urethra
  4. 13. getting rid of wastes the body produces
  5. 14. drains urine
  6. 17. filters 50L of blood per hour
Down
  1. 1. narrowest blood cell
  2. 2. blood blood rich in oxygen
  3. 3. A fatty chemical that can cause blockages in the arteries
  4. 4. gives pigment to red blood cells
  5. 5. blood vessel that carries blood back to the heart
  6. 6. getting rid of solid waste
  7. 7. stores urine
  8. 8. Muscle muscle that never stops working, heart muscle
  9. 10. 20cm long tubes
  10. 11. Tract kidneys, bladder, ureters, urethra
  11. 15. blood vessel that carries blood away from the heart
  12. 16. sweat is excreted through the.......