The partial pressure of oxygen in the alveolar air is:
- $45 \,mm$ of $Hg$
- $95 \,mm$ of $Hg$
- $104\, mm$ of $Hg$
- $110\, mm$ of $Hg$
The Correct Option is C
Solution and Explanation
The partial pressure of oxygen in the alveolar air is 104 mm of Hg. It is the air present within the alveoli of the lungs. It is the average \(P_{O_2}\) in the alveoli where the oxygen is exchanged with carbon dioxide during respiration.
The partial pressure of alveoli varies depending on the change in the altitude and some specific conditions.
So, the correct option is (C): 104 mm of Hg.
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Concepts Used:
Partial Pressure
Partial Pressure is defined as if a container filled with more than one gas, each gas exerts pressure. The pressure of anyone gas within the container is called its partial pressure.
Dalton’s Law of Partial Pressure:
According to Dalton’s law of partial pressures, the total pressure exerted by the mixture of gases is the sum of the partial pressure of every existing individual gas, and every gas is assumed to be an Ideal gas.
Ptotal = P1 + P2 + P3 …
Where P1, P2, P3 are the partial pressures of gas 1, gas 2, and gas 3. Since every gas has an independent behavior, the ideal gas law is used to find the pressure of that gas if its number of moles, the volume of container and temperature is known.