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Across 4. tube that carries urine from the bladder to the outside of the body. 10. tough flexiable tissue that joins the vertebrae. 11. muscle beneath the lungs that contracts and relaxes. 15. waves of musclar contractions that move food through the digestive tract. 16. any place where two or more bones come together. 17. nutrient that usually is the body's main source of energy 18. liquid part of digestion. 19. tough band of tissue that holds bones together at joints.

Down 1. organ that can relax,contract,and provide the force to move bones. 2. two upper chambers of the heart that contract at the same time. 3. irregularly shaped cell fragement that helps clot blood. 5. tubelike passeway for food,liquid, and air. 6. lung disorder in which the bronchi tubes contract quickly and cause shortness of breath. 7. bean shaped organs that are made of nephrons and filters blood. 8. mechanical and chemical breakdown of food into smaller molecules. 9. microscopic blood vessel that connects arteis and veins. 12. building block of protein. (2 Words) 13. chemical in red blood cells that carry oxygen. 14. tough tight-fitting membrane that covers a bone's surface. 15. liquid part of blood made mostly of water.