Human Body Systems Crossword

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Across
  1. 4. System that fights off disease and infection.
  2. 5. Liquid connective tissue pumped by the heart.
  3. 8. Organ that stores bile and releases it into the small intestine.
  4. 14. System that transports blood, oxygen, and nutrients throughout the body.
  5. 16. System that facilitates reproduction.
  6. 17. System composed of bones, cartilage, and joints.
  7. 21. Major muscle that contracts to pull air into the lungs.
  8. 22. The longest part of the digestive tract, where most absorption occurs.
  9. 25. System responsible for gas exchange.
  10. 27. Organ where food is mixed with acid and enzymes.
  11. 28. Organ that produces insulin and digestive enzymes.
  12. 30. System that produces hormones to regulate body functions.
Down
  1. 1. A structure that connects muscle to bone.
  2. 2. The largest internal organ, filters blood and produces bile.
  3. 3. System that provides movement and heat.
  4. 6. The voice box.
  5. 7. System that breaks down food into nutrients.
  6. 9. Tiny air sacs in the lungs where oxygen and carbon dioxide are exchanged.
  7. 10. Tube that connects the pharynx to the stomach.
  8. 11. Where blood cells are produced in long bones.
  9. 12. The main filtering organs of the urinary system.
  10. 13. The body's natural pump.
  11. 15. System that removes nitrogenous waste from the blood.
  12. 18. The study of the body's structure.
  13. 19. The basic functional unit of the nervous system.
  14. 20. Where the main filtering units (nephrons) are located.
  15. 23. Protective outer layer of the body; the largest organ (longer name).
  16. 24. Windpipe; connects the larynx to the bronchi.
  17. 26. System that processes sensory information and directs motor responses.
  18. 29. The body's command center, located in the skull.