Across
- 2. a flap of tissue that keeps blood moving in the right direction through the heart
- 5. one of the two main branches that carry air from the trachea into the lungs
- 8. a lower chamber of the heart that pumps blood out
- 10. the liquid part of blood that carries blood cells and dissolved materials
- 11. a tiny air sac in the lungs where oxygen and carbon dioxide are exchanged
Down
- 1. the molecule in red blood cells that carries oxygen
- 3. This clear fluid is leaked plasma that helps fight infection and carries materials through the lymphatic system
- 4. a small structure that filters lymph and helps the body fight germs
- 6. gas needed for cellular respiration
- 7. an upper chamber of the heart that receives blood
- 9. the windpipe; the tube that carries air to and from the lungs
- 12. this organ in the lymphatic system, recycles old red blood cells