| A | B |
|---|
| respiratory system | responsible for bringing oxygen into and carbon dioxide out of the body |
| breathe | when you bring oxygen in and carbon dioxide out of the body |
| inhale | when you bring in oxygen |
| exhale | when you take away carbon dioxide |
| lungs | the main organ of the respiratoy system |
| alveoli | grapelike clusters of round sacs in the lungs;site of gas exchange |
| diaphragm | dome-shaped musclethat aids in breathing |
| involuntary | works even without you telling it to |
| oxygen | An element that is a component of the air which we inhale |
| carbon dioxide | waste gas that we exhale |
