| A | B |
|---|
| trachea | passageway through which air travels into and out of the body |
| gills | respiratory structures of some aquatic animals through which oxygen is removed through water |
| alveoli | tiny, thin walled sacs in the lungs |
| hemoglobin | oxygen-binding substance found in red blood cells |
| diaphragm | thin sheet of muscle under your lungs |
| cellular respiration | process in which oxygen combines with stored nutrients in cells to release energy, carbon dioxide, and water |
| cilia | tiny hairlike structures lining the trachea |
| asthma | lung disorder in which the bronchial tubes become constricted very quickly |
| emphysema | disease that occurs when air passageways or alveoli lose their ablility to expand and contract |
| cystic fibrosis | ingerited disease in which fluid that lines air passages thickens with mucus, blocking air flow |
| carbon monoxide | poisonous substance found in cigarette smoke |
| exercise | makes breathing more efficient |
| tar | black sticky substance that builds up on the linings of a smokers mouth, throat and lungs |
| earthworm | organism that breathes through its skin |
