respiratory system and circulatory system

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