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Across 1. Name of the strong muscle at he base of the lungs 6. Smallest type of blood vesssel 10. The type of pressure used by some breathing aids to force air into the lungs 14. The process of passing Oxygen into the blood and removing Carbon Dioxide 15. The process by which plants show they have lost too much water. 17. Name given to the system that contains the lungs 18. The large cavity that holds your digestive system 20. Muscles between the ribs 21. This maintains a steep diffusion gradient in the lungs

Down 2. These cells open and close the stomata 3. The type of cell that increases the uptake of water from the soil 4. Movement of materials against a diffusion gradient 5. The movement of water through the plant 7. large thin area that allows materials to pass through it 8. Getting air in and out of your lungs 9. An iron lung creates this to suck air into the lungs 11. The solid part of a solution 12. The process by which plants lose water through the stomata 13. The type of pressure created to a vacuum 16. The diffusion of water 18. Small sacs in the lungs 19. The finger like projections lining the small intestines