| Natural mechanisms in the human body act to prevent or exclude harm by pathogens. The natural protection system in the human body is the immune system. |
| The purpose of the immune system is to keep infectious microorganisms, such as certain bacteria, viruses, and fungi, out of the body, and to destroy any infectious microorganisms that do invade the body. The immune system is made up of a complex and vital network of cells and organs that protect the body from infection. |
| The immune system has the capacity to identify an alien factor penetrating the body, and to act against it. The immune system’s components act to prevent invasion of foreign bodies, or, in cases in which there is invasion, to activate various mechanisms for the elimination of disease inducers of different types. |
| The body's first defense barrier includes components of the innate immune system. These components are not unique or selective, meaning that they are present at all times, regardless of whether there is an intruder. They form a barrier between the body and the outside world and prevent the entrance of both harmless and hazardous foreign bodies alike.
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When a person is not feeling well, he is usually sent by the doctor to take a blood test, where they check (among other things) the concentration of white blood cells.
Explain why. |
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| Why is it that despite our defense system, we are still exposed to disease? |
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| What is the difference between preventing diseases and curing them? |
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|  More about the immune system
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