Your body is under constant attack from viruses and bacteria, but you have a complex defense system that kills foreign invaders - your immune system. What is it and how does it work?
- Our bodies are constantly under attack from bacteria and viruses.
- Our immune system provides a defense, seeking out and killing foreign bodies.
- Physical barriers like skin, hairs, mucus and tears all act to keep out foreign bodies.
- The immune system's key workers are white blood cells called phagocytes and lymphocytes.
Your body is under constant attack.
Microorganisms like bacteria and viruses are all around you.
Too small to see, these pathogens can invade your body and damage your cells, making you ill.
But you have a highly complex defense system that seeks out and kills foreign invaders.
Your immune system.
It uses three lines ...
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