Across
- 2. blood vessels that surround the alveoli
- 5. the part of the respiratory system that Has tiny hairs that filter the air by trapping dirt and bacteria.
- 8. the scientific name for the windpipe
- 9. the release of energy from food in the cell
- 11. the gas that is the most abundant in air
- 12. muscle that helps control our breathing
Down
- 1. turns from clear to milky in the presence of carbon dioxide
- 3. where gas exchange takes place
- 4. the process of releasing air out of the lungs
- 6. taking in oxygen for respiration and releasing carbon dioxide and water vapour
- 7. the trachea has two of these splitting off the end
- 10. the process of bringing air into the lungs