Human Body Systems

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Across
  1. 2. The HB system that delivers substances throughout the body
  2. 4. The HB system that takes in oxygen
  3. 5. The HB system that uses hormones to communicate with the body
  4. 7. Similar cells working together make up this
  5. 10. The tiny balloon-like structures in the lung where gas exchange occurs
  6. 11. The HB system that offers protection and support
  7. 12. The highest level of organization in living things
  8. 13. The 'delivery' tissue that gets needed substances to cells
  9. 16. Blood vessels that carry needed substances to cells
  10. 17. The HB system that turns food into nutrient molecules
  11. 18. Atoms that are bonded together make up these
  12. 19. The tiniest and least complex level of organization in the HB
Down
  1. 1. The HB system that gets rid of liquid waste
  2. 3. The process by which oxygen is used to release energy from nutrient molecules in cells
  3. 6. The HB system that receives information from the environment
  4. 8. The organ responsible for absorbing nutrient molecules into the blood
  5. 9. The muscular organ responsible for getting substances everywhere in the body
  6. 14. The gas needed by the body for cellular respiration
  7. 15. Different tissues working together are known as these
  8. 18. The HB system that enables the body to move