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Given a total atmospheric pressure of 645 mmHg (high elevation): What is the partial pressure of oxygen in the alveoli (in mmHg )? Oxygen: 13.7%

User OnkaPlonka
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Assuming that the alveolar gas is at a temperature of 37°C, the partial pressure of oxygen in the alveoli can be calculated using the following formula:

PAO2 = (Pb - PH2O) x FiO2

Where:
Pb = total barometric pressure = 645 mmHg
PH2O = partial pressure of water vapor = 47 mmHg (at 37°C)
FiO2 = fraction of inspired oxygen = 0.137

Substituting the values into the formula, we get:

PAO2 = (645 - 47) x 0.137
PAO2 = 84.7 mmHg

Therefore, the partial pressure of oxygen in the alveoli is approximately 84.7 mmHg.
User TxAg
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