Across
- 4. tube in your respiratory system
- 6. ___ have the largest brain of all animals
- 10. pumps your blood
- 13. number of bones in your spine
- 16. central nervous system consists of brain and ___
- 17. largest organ in the human body
- 19. this lung is bigger
- 20. anchor bones to muscles
- 21. number of chambers in your heart
- 22. approximately how many bones muscles in your body
- 25. the muscles that bends a joint
- 26. pigment in our skin
- 29. tube in your respiratory system
- 30. lining in the stomach to protect it from acid
- 32. spinal cord and brain are protected by this
- 35. valve in our body that opens to let food enter our intestines
- 36. stuff we make in our stomachs that our body digests
Down
- 1. largest organ in the nervous system
- 2. branch on a neuron
- 3. number of chambers in your heart
- 5. chemical your body makes from the food you eat
- 7. move bones
- 8. used to cool our skin
- 9. approximately how many bones in your body
- 11. take blood away from your heart
- 12. nerve that makes your heart pump
- 14. first thing to break down food
- 15. brain sends messages through the ___ nervous system
- 18. for every thousand red blood cells you have __ white blood cells
- 23. tube in the digestive system
- 24. where blood cells are produced
- 27. tiny passages in our lungs
- 28. heart is a muscle and a __
- 31. food plus ___ makes energy
- 33. largest organ in the body
- 34. another name for the large intestine