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Across 5. type of muscle that is voluntary and multi nucleated 8. what attaches your muscle to your bone 11. calf muscle 12. one unit of muscle from z line to z line 13. muscle in the back of your arm responsible for straightening your arm 15. type of muscle found only in the heart 16. point of muscle attachment that is located on the non-moving bone 17. muscle is the back part of your neck that helps elevate your shoulders 18. when your muscles run out of this gas they are no longer able to contract

Down 1. protein that is identified by being "thin" in appearance 2. to bend a joint 3. the muscle in the back of the leg that flexes the leg, the bicep ________ 4. theory of muscle contraction, once the muscle starts to contract it's..... 5. type of muscle found in the walls of organs and is involuntary 6. your shoulder muscle is called this 7. laying on your back 9. point of muscle attachment that is located on the moving bone 10. type of acid that builds up in your muscles that makes you sore 12. longest muscle in the human body 14. protein that is know as the "thick" filament