| A | B |
|---|
| alveoli | air sacs |
| respiration | exchange of carbon dioxide and oxygen |
| diaphragm | sheet of muscle that helps your chest expand |
| lungs | organ that filters air |
| capillaries | carry oxygen to your lungs |
| bronchial tubes | two branches attached to the trachea |
| mucus | sticky substance that traps air particles |
| carbon dioxide | gets exchanged for oxygen |
| cilia | tiny hairs in the trachea and the bronchial tubes |
| oxygen | help keep your cells alive |
