Question
Chemistry Question on Partial pressure
The partial pressure of oxygen in the alveoli of the lungs is -
A
equal to that in the blood
B
more than that in the blood
C
less than that in the blood
D
less than that of carbon dioxide
Answer
more than that in the blood
Explanation
Solution
The partial pressure of oxygen in alveoli of lungs is less than that in blood. Normal PO2 in alhcoli is 104 mmttg & PO2 in oxygenated blood is 95 mm Hg The partial pressure of oxygen in the alveolar air is 104mmHg. It is the air present within the alveoli of the lungs. It is the average PO2 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.