Biology: Lung Disease

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• Spread by droplets of water/mucous Inhaled into another person's respiratory system

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• The bacteria can grow and divide in the upper regions of the lungs. Phagocytes can engulf and digest the bacteria. They can become encased in a tubercule. The bacteria can destroy the alveoli, causing fibrosis and scar tissue. The damage leads to less diffusion of gases, due to less surface area and larger diffusion pathway.  

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• Persistant cough Tiredness Loss of apetite Fever Coughing up blood

1. Irreversibly thickened
2. Larger diffusion pathway

1. Lack of stretch and recoil
   1. Air cannot be expulsed so lung ventilation is difficult

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• Shortness of breath Fatigue Chest pain Chronic cough 

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• Shortness of breath Chronic cough Fatigue 

1. Surface area of the lungs is reduced
2. Elastin break down
   1. Lack of stretch and recoil
      1. More difficult to expel air

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• Allergens cause WBCs to move to site of infection.  Release histamine Lining of airways inflammed.  Cells produce more mucus. Bronchioles contract, constricting the airways. Airways in turn become blocked 

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• Difficulty breathing Tight chest pain  Wheezing Coughing