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There are three lines of defense that comes under the or belongs to the immune system, let's say is in short, of the human beings.
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Now that is the first line of defense, second line of defense and the third line of defense of the immune system.
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Now, the second line of defense is non -specific in nature and it fights many types of pathogens that tries to enter the human body.
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The second line of defense of the immune system includes number one.
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An example is inflammation.
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Number two is the white blood cells and number three is the response known as the fever.
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Now when any pathogen like the bacteria enters the body, for example, through a scrape in the skin, then the area becomes red, warm, swollen as well as pain.
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Now all these are signs of the process called as or phenomenon called as the inflammation.
01:29
The white blood cells also helps to fight various pathogens that enters the body...