Across
- 3. it pumps blood around your body and it sends oxygen and nutrients to all parts of your body
- 6. supplies blood to the heart because the heart needs it to function.
- 8. a pair of organs in the rib-cage
- 10. are a type of blood vessel that return deoxygenated blood from your organs back to your heart.
- 11. The airway that leads from the larynx to the bronchi and it is also called a windpipe
- 13. They help the body fight infection and other diseases.
- 14. It is naturally present in air and is absorbed by plants in photosynthesis.
- 15. takes nutrients, hormones, and proteins to the parts of the body that need it and the cells also put their waste products into it.
Down
- 1. It plays a major role in breathing, as its contraction increases the volume of the thorax and so inflates the lungs.
- 2. this makes up 21% in the atmosphere
- 4. he large air passages that lead from the trachea to the lungs.
- 5. 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).
- 7. used for breathing and smelling
- 9. are blood vessels that carry blood away from the heart
- 12. they carry oxygen from our lungs to the rest of our bodies.