Which of the following problems may be identified by using an isothermal lung analog to perform quality control on a body plethysmograph? 1. Improperly calibrated mouth pressure transducer 2. Obstructed or perforated pneumotachometer 3. Increase in mechanical resistance 4. Malfunctioning box pressure transducer

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Which of the following problems may be identified by using an isothermal lung analog to perform quality control on a body plethysmograph? 1. Improperly calibrated mouth pressure transducer 2. Obstructed or perforated pneumotachometer 3. Increase in mechanical resistance 4. Malfunctioning box pressure transducer