Which one of the following has the smallest diameter ? (a) Right primary bronchus (b) Left primary bronchus (c) Trachea (d) Respiratory bronchiole (2) Secondary bronchiole...

Dear Student,

Option C is correct. Respiratory Bronchioles have the smallest diameter from the options.

Explanation:
 The Respiratory Bronchiole

 splits into a number of alveolar ducts, which terminate in alveolar sacs and individual alveoli. They have been originated from splitting of terminal bronchioles. look for the splitting pattern in respiratory system in the following diagrams.


Cross Section of lungs (Respiratory System)


Hope this will help you.
Regards,

 


 

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respiratory bronchioles are the smallest in diameter. these are directly attached or linked with the alveoli.
 
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Okk .
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