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