Across
- 2. found in red blood cells and binds to O2
- 3. contracts - we breath in; relaxes - we breath out
- 6. diffuses from alveoli to blood
- 8. carries oxygenated blood AWAY from the heart
- 9. carries deoxygenated blood TO the heart & has valves
Down
- 1. O2 + glucose = ATP + CO2 + water + heat
- 4. air sacs where O2 and CO2 diffuse to and from blood
- 5. the voice box is located here
- 7. has hairs and mucus to filter, moisten and warm air