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Across 1. an organ that provides the force to move bones or body parts. 4. the slippery tissue layer that covers the ends of bones. 6. the building block of protein. 7. a liquid product of digestion 9. mechanical and chemical breakdown of food into smaller molecules that cells absorb and use. 11. waves of muscular contractions that move food threw the digestive trat. 15. microscopic blood vessel that connects arteries and veins. 16. a tough band of tissue that holds bones together at joints.

Down 2. a nutrient that normally is the bodies main source of energy. 3. the liquid part of blood, made mostly of water, in which oxygen, nutrients, and minerals are dissolved. 5. tube-like passage for food, liquid,and air. 8. a tough, tight fitting membrane that covers a bone's surface. 10. a chemical in red blood cells that carries oxygen from the lungs to the body cells and carries some carbon dioxide from body cells, back to the lungs. 12. irregular shaped cell fragment. 13. two upper chambers of the heart that contract at the same time during a heart beat. 14. any place where two or more bones come together.