Across
- 4. It plays a major role in breathing, as its contraction increases the volume of the thorax and so inflates the lungs.
- 6. It is naturally present in air and is absorbed by plants in photosynthesis.
Down
- 1. The airway that leads from the larynx to the bronchi and it is also called a windpipe
- 2. a pair of organs in the rib-cage
- 3. he large air passages that lead from the trachea to the lungs.
- 5. used for breathing and smelling