Across
- 3. the result of feeling the blood pump through the arteries
- 6. tiny sacs in the spongy tissue of the lungs
- 7. breathing involves movement of what and the ribs
- 10. two lower chambers of the heart
- 11. windpipe
- 13. air enters the nose to the what
- 14. these filter dead cells bacteria virusus and other particles
- 17. two upper chambers of the heart
- 18. white blood cells are made up of what
Down
- 1. red blood cells are made up of what
- 2. the pressure of circulating blood against the walls of the arteries
- 4. helps prevent backflow of blood through veins
- 5. main organ of the respiratory system
- 8. Transports nutrients, minerals, proteins through the body
- 9. recycles worn out red blood cells and produces white blood cells
- 11. this organ is active in youth and shrinks in teen years
- 12. made of muscle and cartilage
- 15. connects the passageway from the nose to the mouth
- 16. the heart has how many chambers