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There is elastin in all of the structure this is to allow stretch and recoil.

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The alveoli walls are made out of squamous epithelium walls.

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The capillary walls are made from squamous endothelial cells

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The job of the goblet cells is to secret mucus and they line the trachea.

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Found in trachea and bronchus. The jobs is to waft mucus containing any dust of harmful microorganisms away from the lungs.

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- Decrease friction
- Prevents lungs from adhering (sticking) to body cavity wall.

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In the trachea and bronchus there is cartilage. The cartilage in the trachea is C-shaped and is to maintain an open airway. In the bronchus the cartilage is a different shape.

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The alveoli is only one cell thick to make a short diffusion path.

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Chemical that is produced by the lungs to stop the alveoli from collapsing this reduces the surface tension of H2O

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Layer of moisture lines the alveoli because gases only dissolve if diffused

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O2 diffuses down the gradient from the alveoli to the blood and CO2 diffuses up.

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Each of the alveoli is close to a capillary.

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The walls of the alveoli and capillaries are only one cell thick this allows easy diffusion.

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There are millions of alveoli which allows more space for gas molecules to pass through.