What is the immune system?
Quick Answer
The immune system is the body defence network that detects and destroys harmful invaders like bacteria, viruses, and abnormal cells.
The Full Story
The immune system is a complex defence made of cells, tissues, and organs that protect the body from disease. It has two main branches: innate immunity provides fast, general defence such as skin barriers and inflammation, while adaptive immunity learns to recognise specific threats and remembers them for the future. Special white blood cells identify invaders using molecular markers, then neutralise them and build lasting immunity. Vaccines work by training this memory without causing the disease itself.
Key Facts
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Suggested video title for this topic:
"What Is the Immune System — Your Body Defence Army"
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