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What is an immune system?
Your immune system is designed to protect your body against infections (bacteria, viruses, parasites etc).
The immune system is made up of two different parts:
- The innate immune system
- The adaptive immune system
The innate immune system is like your first line of defense. It’s a non-specific guard against all potential invaders. For example, your skin is a physical barrier which prevents pathogens getting in and when you cut your self you increase your risk of infection as pathogens have a way of getting in. There are lots of different parts of the innate immune system, tears, saliva, stomach acid, and special cells like neutrophils, macrophages and natural killer cells.
The adaptive immune system is the second line of defense and they are specific – in that they recognise specific pathogens and kill those in a targeted response. B and T cells are the main…
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