The innate immune system is able to identify foreign invaders and immediately respond to them. This system is important in order to protect the body from harmful substances.
The response to an infection triggers the arrival of cells called neutrophils, which attack the infection, followed by macrophages that attack bacteria and viruses.
Macrophages release cytokines in order to communicate with other cells when they encounter an enemy. Cytokines are small proteins that carry information. The immune system is activated by cytokines, which give the immune cells direction to fight.
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