Key Area 4.1 - Non-specific Defences

Key Area 4.1 - Non-specific Defences

Physical Chemical Defences

• The human body has the ability to protect itself against pathogens, some toxins and cancer cells through the immune system.
• Epithelial Cells:
• Form a physical barrier to prevent entry from pathogens, e.g. skin.
• Produce secretions against infection, e.g. mucus in the trachea, lysozyme in tears, acid in the stomach.