M2 BASIC RESPIRATORY SYSTEM

6. – Tiny particles in polluted air that we can breathe in, which can harm our lungs.
8. – The act of breathing in air through the nose or mouth.
9. – A very small blood vessel where gases like oxygen and carbon dioxide move in and out of the blood.
11. – The process where cells use oxygen to turn sugar into energy.
14. – Two organs in the chest that take in oxygen and remove carbon dioxide.
15. – A dome-shaped muscle that moves up and down to help us breathe.
17. – A gas in the air that we breathe in and our body uses to make energy.
18. – Tiny air sacs in the lungs where oxygen enters the blood and carbon dioxide leaves.
19. – The body part we use to smell and to take in air when breathing.

1. – A condition that makes it hard to breathe and can be made worse by dirty air or dust.
2. system – The group of organs that help us breathe and exchange gases like oxygen and carbon dioxide.
3. death – Dying earlier than expected, often because of disease or harmful substances.
4. dioxide – A gas that our body makes and breathes out after using oxygen.
5. – The act of breathing out air from the lungs.
7. (fish) – Body parts that fish use to take oxygen from water.
10. blood cells – Cells in the blood that carry oxygen from the lungs to the rest of the body.
12. (grasshoppers) – Small holes on a grasshopper's body where air enters for breathing.
13. – Very tiny particles in the air that can be breathed deep into the lungs and cause health problems.
16. lungs (spiders) – Flat, folded structures that spiders use to breathe.