Across
- 3. Takes up around 21% of the air that we breathe in.
- 5. In our exhaled air, there is more carbon dioxide and __________ vapour.
- 8. ____________ dioxide is removed from the blood at the lungs.
- 9. The function of the respiratory system is to allow ____________ exchange to take place between the body and surroundings.
- 10. The organ that allows air to move between the nose and the lungs.
Down
- 1. Has tiny hairs to trap dust and dirt.
- 2. Each air sac is surrounded by blood _____________ for faster gaseous exchange.
- 4. The amount of _____________ gas is the same in inhaled air and exhaled air.
- 6. sacs The tiny structures in the lungs that increase its exposed surface area for faster gaseous exchange.
- 7. The exhaled air is warmer, more __________ and cleaner.