Which of the following constitute the diffusion membrane or the blood air barrier?

Alveolar wall

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Capillary endothelium

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Pleural membrane

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Basement membrane

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Solution

The correct option is D Basement membrane
The capillaries have thin walls made of simple squamous endothelial cells. The capillaries are separated from the alveoli by a thin layer of connective tissue called basement membrane. The alveolar wall, capillary endothelium, and basement membrane together form what is called the blood air barrier or diffusion membrane.

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