Q: What is the name of the lining that separates the air contained in lungs from venous blood?  

Answer: B

The linings that separate the air contained in lungs from venous blood are composed of squamous epithelium and endothelium. The squamous epithelium forms the lining of the alveoli, which are the tiny air sacs within the lungs where gas exchange occurs. The endothelium lines the adjacent pulmonary capillaries, which are the small blood vessels that transport blood through the lungs. Together, the squamous epithelium and endothelium form a thin barrier, known as the respiratory membrane, which allows for the diffusion of oxygen and carbon dioxide between the air in the lungs and the blood in the capillaries. Option A is incorrect because tunica media refers to the middle layer of blood vessels and is not involved in the respiratory membrane. Option C is incorrect because transitional epithelium is found in organs such as the bladder and is not involved in the respiratory membrane. Option D is incorrect because the correct answer is B.

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