Download - Defense Systems of the Lung
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Lectures on respiratory physiologyLectures on respiratory physiology
Defense Systems of the Defense Systems of the LungLung
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Atmospheric Pollutants
Carbon monoxide
Sulfur oxides
Nitrogen oxides
Hydrocarbons
Particulates
Photochemical oxidants
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Perfect Lung
Types and sources of pollutants
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Photochemical Oxidants
hydrocarbons
nitrogen oxides
ozone, peroxyacyl nitrate,
aldehydes, acrolein, etc.
sunlight
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Perfect Lung
Examples of smog
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Effects of cigarette smokeCarbon monoxide causes up to 10% hemoglobin
“Tars” cause bronchial carcinoma
Smoking causes chronic bronchitis, emphysema,
bronchial carcinoma and coronary heart disease
Insidious effects of
tobacco advertising
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Cancer death rates (male) from 1930 to 2004
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Effect of single cigarette on airways
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Behavior of Aerosols in the Lung
Deposition
Clearance
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Perfect Lung
Mechanisms of deposition of aerosol
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Perfect Lung
Sites of aerosol deposition
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Perfect Lung
Mechanisms of deposition of aerosol
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Accumulation of dust in a coal-miner’s lung
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Perfect Lung
Mechanisms of deposition of aerosol
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Clearance of Deposited Particles
Mucociliary system
Alveolar macrophages
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Clearance of deposited particles
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Mucociliary escalator
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Airway wall showing a mucous gland
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Normal airway (above); Enlarged mucous glands (below)
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Goblet Cell
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Mucociliary escalator
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Gel layer of the mucus above the sol layer
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Cilia just touching the gel layer
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Ciliary action
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Structure of microtubule; diagram (left), EM (right)
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Impairment of Normal Mucociliary Function
Mucus: too much, or change in composition, e.g. chronic bronchitis, cystic fibrosis, asthma
Cilia: paralysis by toxic gases
bronchial epithelium destroyed
congenital defect of ciliary motion
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Alveolar MacrophageAlveolar Macrophage
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Alveolar macrophage in the corner of an alveolus
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Impairment of Normal Macrophage Function
Inhaled gases such as ozone, cigarette smoke
Toxic particles such as silica
Alveolar hypoxia, radiation, corticosteroids, alcohol ingestion