In the pulmonary system, the Alveoli are the small sacs at the end of the bronchioles which are connected to the bronchus. It is within these sacs that gas exchange occurs.
alveoli (singular: alveolus)
Bronchioles
The tubes that connect the bronchi with the alveoli are the bronchioles.
tertiary bronchi divide into bronchioles, which serve small compartments called lobules
Bronchi divide into bronchioles.
Alveoli. - Megan Teague, NC.
The size of the primary bronchioles are from 0.3-1.0 mm then go further to the terminal bronchioles which are smaller in size which connect to the alveoli.
They are called alveoli
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Bronchioles are the small branches coming off the bronchi going to avioles which is blood like leaders
bronchioles
bronchioles
Very small bronchi are called as bronchioles. You have cartilage rings in case of the bronchi. Such rings are absent in case of the bronchiloles. You need such C shaped cartilage rings in case of bronchi, so that they should not get collapsed. The bronchioles are in periphery and they can not collapse because they are very small muscular tubes. C shaped cartilage saves lot of muscle mass of the bronchi to prevent them from collapsing.