respiratory zone

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7 Terms

1
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respiratory lobule - structures
respiratory bronchioles

alveolar duct

alveolar sac

alveoli
2
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respiratory lobule - function
external respiration

gas exchange between air and blood
3
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respiratory lobule - basic wall plan
simple squamous epithelium

smooth muscle

elastic fibres

reticular fibres

* collagen fibres that hold alveolar structures in place
4
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respiratory lobule - vascularisation
capillary network around alveolus
5
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inter-alveolar septum
alveolus wall

partition between adjacent alveoli

extensive pulmonary capillary network
6
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inter-alveolar septum - wall plan
epithelium

cells

* type 1 - squamous
* type 2 - surfactant secreting
* macrophages

connective tissue

* elastic fibres
* capillaries
7
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inter-alveolar septum - membrane
alveolar epithelium

fused basal laminae

endothelium