Excretory system

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Across
  1. 6. emptying of bladder
  2. 10. inability to control external sphincter
  3. 12. collects urine from nephrons
  4. 14. smooth expandable sac to store urine
  5. 16. carries urine from kidney to bladder
  6. 17. tip of medullar pyramid
  7. 18. area around pyramids collects urine
  8. 19. lighter outer region of kidney
  9. 20. smooth triangular area in bladder
Down
  1. 1. artery to kidneys
  2. 2. ph above 7.45
  3. 3. metabolized nucleic acid
  4. 4. ureters, bladder, and urethra
  5. 5. ratio of urine weight to water
  6. 7. second layer, darker red/brown color
  7. 8. knot of capillaries
  8. 9. functional unit of the kidney
  9. 11. surrounds each kidney
  10. 13. tube that carries urine out of bladder
  11. 15. separates pyramids