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Question

When there is no air in initial bronchioles, they do not collapse. It is due to the presence of _________________.

A
Lecithin
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B
Complete cartilaginous rings
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C
Incomplete cartilaginous rings
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D
Transformed elastic cartilage
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Solution

The correct option is D Transformed elastic cartilage
This is due to the presence of transformed elastic cartilage which gives support to the initial bronchioles and prevents it from collapsing. The incomplete cartilaginous rings that are present in the trachea and bronchi are absent in the bronchioles. They are supported by the transformed elastic cartilage.
So, the correct option is 'transformed elastic cartilage'.

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