Across
- 3. breathing, external respiration and gas transport by blood are all examples of
- 8. the trachea is made up of c shaped rings made of _
- 10. the bronchial tubes _ the air we breath in
- 11. what is commonly known as 'the windpipe'
- 13. what cells in the trachea trap dirt
- 14. letting air into the lungs
Down
- 1. small and we have lots of them
- 2. _ have thin walls
- 3. red blood cells acronym
- 4. the organ that warms the air with body temperature
- 5. muscle located under the lungs
- 6. the process of which a substance moves from high concentration to a low concentration
- 7. the top 2 chambers of the heart
- 9. letting air out of the lungs
- 12. the _ has four chambers