Aerobic activities a. enable muscles to use less oxygen than normal b. do not require voluntary muscle c. force muscle cells to use more vitamins and minerals for energy d. involve sustained, rhythmic contractions of certain large skeletal muscles

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