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Question

Single-layer of flattened cells with boundaries is observed in all of the following except

A
Blood vessels
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B
Lining of oesophagus
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C
Air sacs of lungs
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D
Both (A) and (B)
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Solution

The correct option is B Lining of oesophagus
Single layered of flattened cells with irregular boundaries constitute the squamous epithelium which is found in walls of blood vessels and air sacs of lungs. The epithelium that lines the oesophagus is stratified epithelium.
So, the correct option is 'lining of the oesophagus'.

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