Human anatomy crossword

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Across
  1. 3. - Windpipe connecting throat to lungs
  2. 5. - Tube connecting kidney to bladder
  3. 6. - Fluid part of blood
  4. 7. - System that breaks down food
  5. 10. - The largest organ of the body
  6. 11. - Pumping organ of the circulatory system
  7. 12. - Tiny air sacs in the lungs
  8. 13. - Main organ of the nervous system
Down
  1. 1. - Muscle separating chest from abdomen
  2. 2. - Blood vessels carrying oxygen-rich blood
  3. 4. - Structural units of bones
  4. 8. - Gland that regulates metabolism
  5. 9. - Shoulder blade bone
  6. 10. - Bone protecting the brain