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Across 1. links your brain to the rest of your body 6. part of brain that controls the involuntary muscles 7. little balloon-like sacs in the lungs 10. these are caused by the diaphragm contracting 11. the number of lumbar vertebrae we have 12. brings in oxygen and releases carbon dioxide gas 13. protects the lungs, heart, liver, and stomach 14. allows you to move your head 15. a thick sheet of muscle that help make the lungs work

Down 1. seven pairs of ribs attach to this 2. the network of nerve cells formed by the brain and spinal cord 3. a waste product from the breakdown of food 4. twelve pairs of ribs are attached to these 5. these ribs don't attach in front to anything 8. number of nerves we have 9. supports your body and protects the spinal cord