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Your body is under constant attack from viruses and bacteria, but you have a complex defence system which kills foreign invaders - your immune system. What is it and how does it work?Key facts
- Our bodies are constantly under attack from bacteria and viruses.
- Our immune system provides a defence, 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.
Transcript
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 defence system that seeks out and kills foreign invaders. Your immune system.
It uses three ...
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