Pathogens
- Created by: Amber
- Created on: 13-12-12 12:01
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- Pathogens
- Enter
- Cuts
- Digestive system - food/drink
- Respiratory system - inhaled
- Mucosal surfaces - eyes, nose and mouth
- Barriers
- Stomach acid - most killed but some survive and pass into the intestines where they invade cells of the gut wall and casue disease
- Skin - physical barrier, blood clots prevent entry
- Gut and skin flora - Intestines and skin are naturally covered in billions of microorganisms (flora). They compete with pathogens for nutrients and space = limits no. of pathogens
- Lysozyme - mucosal surfaces produce secretions containing enzymes (lysozymes) which kill bacteria by destroying their cell walls
- Antigens
- When a pathagen invade the body, the antigens on its cell surface are recognised as foreign, this activates cells in immune system.
- Enter
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