Question

why partial pressure of oxygen is high in atmosphere than alveolar pressure ​

Answer 1

Partial pressures

The alveolar oxygen partial pressure is lower than the atmospheric O2 partial pressure for two reasons. ... The rest of the difference is due to the continual uptake of oxygen by the pulmonary capillaries, and the continual diffusion of CO2 out of the capillaries into the alveolar

Answer 2

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Why partial pressure of Oxygen is high in atmosphere than alveolar pressure ?

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The alveolar oxygen partial pressure is lower than the atmospheric (O)2 partial pressure for two reasons:

• Firstly, as the air enters the lungs, it is humidified by the upper airway and thus the partial pressure of water vapour (47 mmHg) reduces the oxygen partial pressure to about 150 mmHg.

• The rest of the difference is due to the continual uptake of oxygen by the pulmonary capillaries, and the continual diffusion of (CO)2 out of the capillaries into the alveoli.

The alveolar (pO)2 is not routinely measured but is calculated from blood gas measurements by the alveolar gas equation.

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