Non-specific defences of the human body against pathogens
Lesson 7 / 7
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I can describe defences of the human body against pathogens including physical, chemical and microbial defences, and phagocytosis.
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The human body has defences against infection that work against all pathogens (are not targeted at specific pathogens).
Physical defences include the skin, hairs and cilia.
Chemical defences include tears, saliva and stomach acid.
Microbial defences are provided by microorganisms on, and in, our bodies that compete against pathogens.
White blood cells called phagocytes are part of the immune system and engulf and destroy pathogens by phagocytosis.
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