| A | B |
|---|
| hemoglobin | oxygen-binding substance found in red blood cells which contains iron that binds with oxygen |
| trachea | passageway through which air travels into and out of the body |
| regular exercise | This activity makes your breathing more efficient |
| cilia | tiny hairlike structures lining the trachea |
| diaphragm | thin sheet of muscle beneath lungs |
| asthma | Bronchial tubes become constricted very quickly |
| alveoli | tiny, thin-walled sacs in the lung |
| cellular respiration | oxygen combines with stored nutrients in cells to release energy, carbon dioxide and water |
| emphysema | air passageways or alveoli lose their elacticity |
| gills | respiratory structoure of some aquatic animals through which oxygen is removed from water |
| book lungs | found in spiders and fuctions in a way that is most similiar to gills |
| earthworm | is a comples organism that doesn't need a trachea for respiration |
| water vapor | gas that causes exhaled air to feel moist |
