Question 5 of 11intermediate🔧 ApplyMCQ1 mark

What will be the pO₂ and pCO₂ in the atmospheric air compared to those in the alveolar air?

Exercise: EXERCISES | Q: 5
For More Understanding

Explanation

According to Table 14.1 provided in the context, the partial pressure of oxygen (pO₂) in atmospheric air is 159 mmHg, whereas in the alveoli it is 104 mmHg. This indicates that pO₂ is higher in atmospheric air compared to alveolar air. Conversely, the partial pressure of carbon dioxide (pCO₂) in atmospheric air is 0.3 mmHg, while in the alveoli it is 40 mmHg. This shows that pCO₂ is lesser in atmospheric air compared to alveolar air. Therefore, Option B is the correct choice.

Solution Steps

  1. Step 1: Identify the pO₂ values from Table 14.1: Atmospheric Air = 159 mmHg and Alveoli = 104 mmHg.

  2. Step 2: Compare the pO₂ values: 159 > 104, meaning pO₂ is higher in atmospheric air.

  3. Step 3: Identify the pCO₂ values from Table 14.1: Atmospheric Air = 0.3 mmHg and Alveoli = 40 mmHg.

  4. Step 4: Compare the pCO₂ values: 0.3 < 40, meaning pCO₂ is lesser in atmospheric air.

  5. Step 5: Conclude that atmospheric air has higher pO₂ and lesser pCO₂ compared to alveolar air, matching Option B.

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