Human Defence Systems
The human body has evolved multiple mechanisms to prevent pathogens from entering and causing infection.
Can you identify the non-specific defences?
What is Human Defence Systems?
"Human defence systems are mechanical and chemical barriers, such as the skin and stomach acid, that prevent pathogens from entering the body."
Which structure acts as a first line of defence against pathogens entering the body?
How do the trachea and bronchi help defend the body against disease?
Why is the stomach part of the body's non-specific defence system?
First Line Defences
The skin acts as an physical barrier and produces antimicrobial secretions.
Stomach acid kills pathogens that enter the body through food or mucus.
Tears contain enzymes that digest the cell walls of many bacteria.
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