Which factor is related to seat belt use in teens? O A. Type of vehicle
O B. Speed limit on roadways
O C. Peer use of a seat belt
O D. Weather conditions

Which of the following are considered general purposes of performing pulmonary function tests (pfts)? 1. the functional status of the lungs 2. the diffusion characteristics of the alveolar-capillary membrane 3. how much and how fast gas can be moved into and out of the lungs 4. the specific diagnosis of pulmonary disease