Across
- 5. machine that provides mechanical ventilation
- 7. organ responsible for breathing
Down
- 1. part of a chromosome
- 2. plays a major role in breathing, as its contraction increases the volume of the thorax and so inflates the lungs
- 3. when a virus mutates itself, it creates a new _______
- 4. brings air to and from the lungs
- 6. where the change of oxygen and carbon dioxide happens