Elastic fibres present in bronchioles are made up of

Elastin protein

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Chitin protein

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Fatty tissue

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Smooth muscle fibres

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Solution

The correct option is A Elastin protein
The bronchioles are made up of elastic fibres. These elastic fibres contain the elastin protein. Elastin is a highly elastic protein and helps many tissues in the body to resume their shape after stretching or contracting. It serves the same purpose in the bronchioles too allowing the nasal passage to remain open.

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