In lungs, air is separated from venous blood by
(1) Squamous epithelium + tunica externa of blood vessels.
(2) Squamous epithelium + endothelium of blood vessels.
(3) Transitional epithelium + tunica media of blood vessel.
(4) Columnar epithelium + 3 layered wall of blood vessel.
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Answer:
option 2 is correct
Explanation:
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