| A | B |
| apnea | absence of respiration; temporary cessation of respirations |
| aspiration | process of inhaling food, fluid, or a foreign substance into the respiratory tract |
| foreign-body airway obstruction | choking |
| inspiration | to breathe in |
| expiration | the expulsion of air from the lungs in breathing |
| respiration | the taking in of oxygen and its use in the tissues and the giving off of carbon dioxide |
| perfusion | passing of a fluid through spaces |
| atelectasis | lack of air in the lungs caused by the collapse of the alveoli of the lungs |
| dyspnea | difficult or labored breathing |
| orthopnea | condition in which normal breathing is possible only in an upright position |
| eupnea | normal eupnea |
| pulse oximeter | small electronic device that fits over the index finger and determines the amount of oxygen in the blood |