Lectures on respiratory physiology Defense Systems of the Lung.

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Presentation transcript:

Lectures on respiratory physiology Defense Systems of the Lung

Atmospheric Pollutants Carbon monoxide Sulfur oxides Nitrogen oxides Hydrocarbons Particulates Photochemical oxidants

Perfect Lung Types and sources of pollutants

Photochemical Oxidants hydrocarbons nitrogen oxides ozone, peroxyacyl nitrate, aldehydes, acrolein, etc. sunlight

Perfect Lung Examples of smog

Effects of cigarette smoke Carbon 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

Cancer death rates (male) from 1930 to 2004

Effect of single cigarette on airways

Behavior of Aerosols in the Lung Deposition Clearance

Perfect Lung Mechanisms of deposition of aerosol

Perfect Lung Sites of aerosol deposition

Perfect Lung Mechanisms of deposition of aerosol

Accumulation of dust in a coal-miner’s lung

Perfect Lung Mechanisms of deposition of aerosol

Clearance of Deposited Particles Mucociliary system Alveolar macrophages

Clearance of deposited particles

Mucociliary escalator

Airway wall showing a mucous gland

Normal airway (above); Enlarged mucous glands (below)

Goblet Cell

Mucociliary escalator

Gel layer of the mucus above the sol layer

Cilia just touching the gel layer

Ciliary action

Structure of microtubule; diagram (left), EM (right)

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

Alveolar Macrophage

Alveolar macrophage in the corner of an alveolus

Impairment of Normal Macrophage Function Inhaled gases such as ozone, cigarette smoke Toxic particles such as silica Alveolar hypoxia, radiation, corticosteroids, alcohol ingestion