A healthy individual has a PaO2 of 14 kPa and a saturation of 98%. In comparison

Question

A healthy individual has a PaO2 of 14 kPa and a saturation of 98%. In comparison, an anaemic individual would have: a) Lower O2 content and unchanged PaO2. b) Lower O2 content and decreased PaO2 Decreased saturation and unchanged PaO2 Decreased saturation and decreased PaO2 Unchanged saturation and increased PaO2 In the isolated saline filled lung, compliance is: a) Much lower than for air filled lungs. b) Much larger than for air filled lungs. c) Lower during inflation, in comparison to deflation. d) Higher during inflation, in comparison to deflation. e) Unable to be measured. A pneumothorax would cause the: a) Lungs to increase in volume, and the chest wall to collapse inwards. b) Lungs and chest wall to decrease in volume. c) The lungs to collapse inwards, and the chest wall spring outwards. d) The intrapleural pressure to exceed atmospheric pressure. The intrapleural pressure to become more negative. Airway resistance is: a) Flow rate divided by the pressure difference between the alveoli and the mouth. b) The pressure difference between the alveoli and the mouth, divided by flow rate. Doubled when the airway radius is halved. d) Independent of airway length. e) Independent of lung volume.

Explanation / Answer

1. c) Decreased saturation and an unchanged PaO2.

2. b) Much larger than for air filled lungs

3. c) the lungs collapse inwards, and the chest wall springs outward

4. b) pressure difference between the alveoli and the mouth, divided by flow rate

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