Question:
Before the formation of oxyhaemoglobin, the \(\text{O}_{2}\) has to pass through _________ membranes from the alveolar air.
Before the formation of oxyhaemoglobin, the \(\text{O}_{2}\) has to pass through _________ membranes from the alveolar air.
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Count the cell layers oxygen crosses from alveolar air until it enters the red blood cell.
Updated On: Nov 12, 2026
- \(2\)
- \(7\)
- \(3\)
- \(4\)
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Verified By Collegedunia
The Correct Option is C
Solution and Explanation
Step 1: Understanding the Concept
Oxyhaemoglobin forms only inside the red blood cell, so oxygen must reach that cell first.
Step 2: Counting membranes
Oxygen crosses the alveolar epithelial cell membrane, then the endothelial membrane of the pulmonary capillary, and finally the membrane of the red blood cell.
Step 3: Note
The thin basement layer between them is non-cellular and is not counted as a membrane.
Final Answer:
Oxygen crosses 3 membranes before forming oxyhaemoglobin. \[ \boxed{\text{(C) }3} \]
Oxyhaemoglobin forms only inside the red blood cell, so oxygen must reach that cell first.
Step 2: Counting membranes
Oxygen crosses the alveolar epithelial cell membrane, then the endothelial membrane of the pulmonary capillary, and finally the membrane of the red blood cell.
Step 3: Note
The thin basement layer between them is non-cellular and is not counted as a membrane.
Final Answer:
Oxygen crosses 3 membranes before forming oxyhaemoglobin. \[ \boxed{\text{(C) }3} \]
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