Q: Which of the following is not a component of the diffusion membrane in the lungs?  

Answer: B

The diffusion membrane in the lungs is made up of three layers: the thin squamous epithelium of the alveoli, the endothelium of the blood capillaries, and the basement membrane in between them. Cuboidal epithelium is not a component of the diffusion membrane. The thin squamous epithelium is important because it allows for easy diffusion of gases, while the endothelium provides a large surface area for gas exchange. The basement membrane acts as a support structure for these layers.

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