| A | B |
|---|
| respiratory system (n) | the body system that exchanges oxygen for carbon dioxide; a.k.a. the gas exchange system |
| gas exchange (n) | the process by which gases pass into and out of an organism’s body |
| trachea (n) | the main tube that leads from the throat to the lungs; a.k.a. the windpipe |
| bronchi (n) | the tubes in the lungs through which air passes to get deep into the lungs (into the alveoli) |
| alveoli (n) | tiny air sacs in the lungs |
| diffusion (n) | the spreading of a substance by moving from an area of higher concentration to an area of lower concentration |
| emphysema (n) | a disease in which the alveoli break down, making it difficult to get enough oxygen into the blood |
| asthma* (n) | a chronic illness of the respiratory system characterized by wheezing, coughing, and difficulty breathing |
| inspiration / inhalation* (n) | to breathe in |
| expiration / exhalation* (n) | to breathe out |
