Across
- 2. it pumps blood around your body and it sends oxygen and nutrients to all parts of your body
- 5. are blood vessels that carry blood away from the heart
- 7. used for breathing and smelling
- 8. It plays a major role in breathing, as its contraction increases the volume of the thorax and so inflates the lungs.
- 9. this makes up 21% in the atmosphere
Down
- 1. he large air passages that lead from the trachea to the lungs.
- 3. The airway that leads from the larynx to the bronchi and it is also called a windpipe
- 4. It is naturally present in air and is absorbed by plants in photosynthesis.
- 6. a pair of organs in the rib-cage