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Across 2. Clear fluid that fills spaces around body cells 3. Large sheetlike muscle that divides the body cavity into two smaller cavities 7. Small irregular-shaped anuclear cells 11. Also know as respiratory membrane 12. Clear fluid that helps warm and moisten air coming through the nose 13. Inhereted characteristics such and congenital heart disease 14. Tiny blood vessels that connect arteries to veins 15. The branches of the trachea that divides into two small tubes

Down 1. These carry blood to the heart 2. Main organs of respiration 4. Vessels that carry blood away from the heart 5. Inflamation of the bronchial tubes 6. The oxygen carring protein in blood 8. A colorless, odorless, tasteless gaseous chemical element that humans breathe in 9. 90% water and makes up 55% of the total amount of your blood 10. Flap of tissue that protects the larnyx's opening