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Why is it that bronchioles can constrict and so reduce their diameter while secondary bronchi and respiratory bronchioles cannot constrict?

waelhammad
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2022-10-18
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Why is it that bronchioles can constrict and so reduce their diameter while secondary bronchi and respiratory bronchioles cannot constrict?

  1. Bronchioles have smooth muscle but no cartilage in their walls while secondary bronchi are supported by cartilage.
  2. Bronchioles have smooth muscle but no cartilage in their walls while respiratory bronchioles are supported by cartilage.
  3. Bronchioles have cartilage but no smooth muscle in their walls while secondary bronchi are supported by cartilage.
  4. Bronchioles have cartilage but no smooth muscle in their walls while respiratory bronchioles only have smooth muscle in their walls.
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waelhammad
2022-10-18
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A: Because bronchioles have no cartilage in their walls they are able to dilate and constrict to alter the amount of air that enters alveoli. Respiratory bronchioles that feed into alveolar ducts have little smooth muscle and no cartilage.  

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