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Across 2. tubelike passage ways for food, liquid and air 3. the nutrient that usually is the body's main source of energy 5. chemical in red blood cells that carries oxygen 6. microscopic blood vessels that connect arteries and veins 8. the tough, tight fitting membrane covering bones 11. the building block of protein (2 Words) 12. the breakdown of food into into molecules cells are able to absorb 13. lung disorder in which the bronchial tubes contract quickly 15. the liquid part of blood mostly made of water 16. muscle beneath the lungs 17. the tough band of tissue holding bones together at the joint 18. where two or more bones meet 19. the organ that provides the force to move bones and body parts

Down 1. the liquid product of digestion 2. waves of muscular contractions moving food through the digestive tract 4. irregularly shaped cell fragment that helps clot blood 7. bean shaped urinary system organ 9. tube that carries urine 10. the tissue layer covering ends of bones to reduce friction making movement easier 14. the two upper chambers of the heart