What happens during isokinetic exercise? muscles contract at a constant rate. muscles contract and relax to move a joint. muscles do not contract at all. muscles contract with very little body movement.

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