Which of the following choices BEST describes the relationship between intensity and time in a successful exercise program?
A as intensity increases, time should increase
В. as intensity decreases, time should decrease
C as intensity increases, time should decrease
D intensity and time should never change

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