Human Body Systems

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Across
  1. 4. The term for the four sections of the heart
  2. 7. Main organ for the circulatory system
  3. 8. The main organ of the respiratory system
  4. 11. Tiny blood vessels that surround air sacs
  5. 12. Blood vessels that return blood to the heart
  6. 14. Your heart is the size of this body part
  7. 15. intestine The organ where most food is digested
  8. 17. Groups of neurons that pass along information
  9. 19. Long tube which connects to the mouth and stomach
  10. 21. Where bones meet
  11. 23. Main organ for the nervous system
  12. 24. A kind of skeletal muscle with light and dark stripes
Down
  1. 1. A kind of muscle found in the walls of the stomach
  2. 2. A system that supports the body and protects organs
  3. 3. A kind of muscle that makes up the walls of the heart
  4. 5. Vessels that carry blood from the heart
  5. 6. A system that provides nutrients to the body
  6. 9. A system that sends and receives messages
  7. 10. Helps soften food and starts the digestion process
  8. 13. A bag made of smooth muscles that mixes food with digestive juices
  9. 16. A system that helps move parts of the body
  10. 18. Nerve cell
  11. 20. Tube of nerves that runs through the backbone
  12. 22. Cells of the same type