Across
- 6. The many little branches of respiratory system
- 9. Movement of the particles from an area of high concentration to low concentration
- 12. Keeps blood from flowing backwards
- 13. The grape like clusters of air sacs in the lungs
- 16. ventricle, Pumps blood to the lungs
- 18. The tube that connects the throat and bronchi (hint: Fork in the road)
- 19. Small blood vessels with thin walls that are wrapped around alveolares
Down
- 1. What we breathe in
- 2. The two large lightweight organs of the respiratory system
- 3. atrium, Receives blood from all the parts of the body
- 4. dioxide, What we breathe out
- 5. 90% water 55% fluid 45% cells and 10% sugar, waste, and nutrients
- 7. Blood cells, Contains hemoglobin which gives its red color
- 8. ventricle, Pumps blood to all the parts of the body
- 10. A type of blood cell that has no nucleus
- 11. Always carries deoxygenated blood towards the heart
- 14. atrium, Receives blood from the lungs
- 15. The large band of muscle that controls the size of the chest cavity (hint: at the bottom of the rib cage)
- 17. Always carries blood away from the heart