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Quiz yourself on Human Defense Systems - Non-specificGet your flashcardsBuild my revision planTrack my progressFirst Line of Defence: Chemical Barriers
Stomach Acid
Your stomach produces hydrochloric acid that creates an extremely hostile environment for pathogens that are swallowed:
- Low pH: Stomach acid has a pH of around 2, killing most bacteria and viruses
- Denatures proteins: The acid destroys the proteins and enzymes that pathogens need to survive
Lysozyme
Lysozyme is an antimicrobial enzyme found in several body secretions:
- Where it is found: In tears, saliva, and mucus
- How it works: It destroys the cell walls of bacteria, killing them
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