In a person breathing normally at rest with an environmental tempera ture of 25°C, the partial pressure of

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2022-08-08

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In a person breathing normally at rest with an environmental tempera ture of 25°C, the partial pressure of.

CO2 in alveolar air is about twice that in room air.
Water vapour in alveolar air is less than half the alveolar PCO2 level.
Water vapour in alveolar air is greater than that in room air even at 100 per cent humidity.
O2 in expired air is greater than in alveolar air.
CO2 in mixed venous blood is greater than in alveolar air.

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safaTerkawi

2022-08-08

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A. False Room air PCO2 (0.2 mmHg; 0.03 kPa) is negligible compared with alveolar air PCO2 (40 mmHg; 5.3 kPa).

B. False Alveolar H2O vapour pressure at 37oC is 47 mmHg (6.3 kPa).

C. True Alveolar air is saturated with water vapour at 37˚C. At 25˚C saturated vapour pressure is 24 mmHg (3.2 kPa), about half that at 37˚C.

D. True Expired air is alveolar air plus dead space air.

E. True This is necessary for CO2 excretion by diffusion

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