Air and Respiratory System

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Across
  1. 2. The openings of the nose where air enters.
  2. 5. Living things need oxygen to ________.
  3. 7. Air enters and leaves our body through the ________.
  4. 9. The hairs in the nose help keep the air ________.
  5. 11. Running and exercising are examples of physical ________.
  6. 12. This gas is found in the air and is given out when we breathe out.
  7. 15. Oxygen is carried around the body by the ________.
  8. 16. The gas that makes up the largest part of air.
  9. 17. These trap dust and dirt in the nose.
  10. 19. Oxygen is transported to all parts of the ________.
  11. 20. The tube that carries air from the nose to the lungs.
  12. 21. The organs where oxygen enters the blood.
  13. 23. Breathing rate is measured by the number of breaths in one ________.
Down
  1. 1. Fish breathe using their _________.
  2. 3. The number of breaths taken in one minute is called the breathing ________.
  3. 4. Tiny openings on leaves are called _________.
  4. 6. The system in our body that helps us breathe.
  5. 8. Air is made up of different ________.
  6. 10. The gas that plants take in to make food during photosynthesis.
  7. 13. Oxygen is ________ into the blood in the lungs.
  8. 14. The process of taking air into and out of the body.
  9. 18. The gas that living things need to stay alive.
  10. 22. Tiny particles trapped by the hairs in our nose.