Across
- 3. Muscle that contracts during inhalation ?
- 5. Main airway leading to the lungs ?
- 7. Oxygen-carrying protein in red blood cells ?
- 8. Primary gas exchanged in alveoli ?
- 9. Fluid that reduces surface tension in the alveoli ?
Down
- 1. Brain region controlling breathing ?
- 2. Smallest airways in the respiratory system ?
- 4. Dioxide Gas produced as a waste product of respiration ?
- 6. The process of gas exchange in the lungs ?
- 10. Volume of air moved in and out during normal breathing ?