Which of the following pulmonary function devices directly collect and measure gas volumes? 1. Water-sealed spirometer 2. Dry rolling-seal spirometer 3. Bellows spirometer 4. Pneumotachometer
a. 3 and 4 only
b. 1 and 2 only
c. 1, 2, and 3 only
d. 2, 3, and 4 only
ANS: C
Flow measuring devices are commonly called pneumotachometers.
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