Human Body Systems

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Across
  1. 4. This system transports oxygen and nutrients throughout the body.
  2. 5. This large muscle helps you breathe by moving up and down.
  3. 7. You have 300 at birth and 206 by the time you are an adult.
  4. 8. The protective structure made of bones that surrounds the brain.
  5. 9. The muscle that pumps blood through your body.
  6. 10. The smallest bones in the body are located here.
  7. 11. The main organ of the nervous system.
  8. 14. The tube-like structure in the nervous system that connects the brain to the rest of the body.
  9. 15. These tiny sacs in the lungs help oxygen enter the blood.
  10. 17. The system helps the body take in oxygen and release carbon dioxide.
  11. 18. The organ that stores bile to help break down fats.
  12. 19. The part of the digestive system where most nutrients are absorbed.
Down
  1. 1. This organ helps filter toxins from the blood.
  2. 2. The liquid carries oxygen and nutrients through the circulatory system.
  3. 3. This system includes bones and muscles working together.
  4. 4. The part of the brain that controls balance and coordination.
  5. 6. The largest bone in the human body, found in the leg.
  6. 12. The system that controls your body’s movements and reactions.
  7. 13. The windpipe that connects your mouth to your lungs.
  8. 16. The long tube that carries food from your mouth to your stomach.