The immune system - Spoken English
Every second of your life you are under threat. Bacteria, viruses, spores and other living stuff wants to enter your body and take advantage of the resources inside of you. To protect you, the immune system is always there. The immune system is a powerful army of cells that fights and sacrifices itself for your survival. Without it, you would die in no time. Once there is a possibility of danger of viruses entering your body, the immune system will activate itself, multiplying many times. After the fight, the cells commit suicide to save your body?s power. There is also one type of cell in the immune system which works as a memory, so that the next time the same viruses enter your body they will know best how to react.
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