human body

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Across
  1. 5. The body's natural defense system
  2. 8. Long tube that moves food from mouth to stomach
  3. 10. Nerve cell responsible for transmitting signals
  4. 12. Organ that filters waste from the blood
  5. 13. Largest organ of the body
  6. 14. Mature bone cell
  7. 15. Long bones in the foot
  8. 19. Brain region controlling the pituitary gland
  9. 20. Inflammation of the lungs
Down
  1. 1. Long part of a neuron that transmits signals
  2. 2. Connects muscle to bone
  3. 3. Protein that carries oxygen in red blood cells
  4. 4. Bones that protect the brain
  5. 6. Gland system that secretes hormones
  6. 7. Helps fight infections
  7. 9. Process of maintaining a stable internal environment
  8. 11. Air sacs in the lungs where gas exchange occurs
  9. 16. Blood vessels that carry oxygenated blood away from the heart
  10. 17. Junction between two nerve cells
  11. 18. Major muscle used for breathing