| A | B |
|---|
| Respiration | Chemical reactions that release energy in cells |
| Glucose | Carbohydrate used in respiration |
| Carbon dioxide | Gas produced in respiration |
| Oxygen | Combines with glucose in respiration |
| Nitrogen | Makes up 79% of the atmosphere |
| Bicarbonate indicator | Indicator used to detect carbon dioxide |
| Trachea | The tube from the throat to the lungs |
| Bronchus | smaller branches after the trachea |
| Alveolus | The air sacs for gas exchange in the lungs |
| Capillary | Tiny blood vessels where gas exchanges |
| Ventilation | Movement of gas into and out of the lungs |
| Diffusion | movement of a gas from a high to a low concentration |
| Water vapour | Gas breathed out with carbon dioxide |
| Lungs | air sacs in the body where gas exchange take place |
| Heart | organ that pumpls blood round the body |
| 21% | percent of oxygen in air breathed in |
| 18% | percent of oxygen in air breathed out |
| 3% | percent of carbon dioxide in air breathed out |
| 0.03% | percent of carbon dioxide in air breathed in |
| Combustion | rapid break down of food for energy |
