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Chapter 4.5 ­ Lung Diseases ­ Notes
Pulmonary Fibrosis:
Arises when scars form on the epithelium of the lungs, causing them to thicken
irreversibly. This means that oxygen cannot diffuse into the blood as efficiently as the
diffusion pathway has been lengthened. Fibrosis also reduces the elasticity of the

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feels breathless. The smaller alveolar surface area leads to reduced oxygen levels in
the blood, so the patient breathes more rapidly. Chronic coughing is due to the lung
damage and the body's efforts to remove immovable damaged tissue and mucus.
This cannot be removed naturally as the cilia on the…


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