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Old 08-21-2012
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Arrow Belindalimm Daily Questions: Histology #1

Bronchi are lined with Ossis stratified epithelium. As the airways continue distally, the epithelium changes. Which of the following features is last to disappear as the epithelium changes along the respiratory tube?

A. Cilia
B. Goblet cells
C. Mucous glands
D. Serous glands
E. Cartilage
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Old 08-21-2012
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A...............cilia
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A...............cilia
Correct! The answer is A.
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Old 08-21-2012
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Correct Answer

Cartilage, goblet cells, and glands stop at the end of the smallest bronchi.
Epithelium changes from pseudostratified columnar into simple cuboidal at the end of the smallest terminal bronchioles .
Cilia also stops at the end of the terminal bronchioles.

Type 1 pneumocystes are squamous.
Type 2 pneumocystes are cuboidal.
Clara cells are columnar.
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Old 08-21-2012
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Correct! The answer is A.
Thanks...But could you plz allow some time for reasoning over the other options in the answers by other fellow members...That will help better memorization.

Thanks once again for your effort and nice question.
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Originally Posted by Doc4Step1 View Post
Thanks...But could you plz allow some time for reasoning over the other options in the answers by other fellow members...That will help better memorization.

Thanks once again for your effort and nice question.
Definitely sure! I'll give it more room for answers and explanations from more people. Thank you for your advice!
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Old 08-22-2012
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Quote:
Originally Posted by Dr.Lacune View Post
Cartilage, goblet cells, and glands stop at the end of the smallest bronchi.
Epithelium changes from pseudostratified columnar into simple cuboidal at the end of the smallest terminal bronchioles .
Cilia also stops at the end of the terminal bronchioles.

Type 1 pneumocystes are squamous.
Type 2 pneumocystes are cuboidal.
Clara cells are columnar.
are you saying there is no ciliated columnar epi in trachea?

also to orignal question what is Ossis?

thx
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are you saying there is no ciliated columnar epi in trachea?

also to orignal question what is Ossis?

thx
Sorry for my typo. It should be pseudostratified epithelium.
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Old 08-22-2012
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are you saying there is no ciliated columnar epi in trachea?

also to orignal question what is Ossis?

thx
Trachea has cilia and it's pseudostratified columnar epithelium.that epithelium becomes cuboidal after the terminal bronchioles, and it makes sense because after the terminal bronchioles, the respiratory unit starts which includes the respiratory bronchioles, alveolar ducts, and alveoli. Those as well gonna be mixed cuboidal and squamous as there is two different types of pneumocystes .
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