Role of the complement system:
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Complement system is a defensive mechanism consisting of serum or plasma proteins which attack and destroy the invading micro-organisms.
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It consists of a group of 30 serum proteins which include structural proteins and enzymes.
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Due to the movement of these proteins, pores get developed on the cell wall of the microbes.
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The surrounding fluid rushes into the cell through there pores which results in lysis of the microbial cell that leads to death.
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Complement system together with phagocytic barriers, inflammatory barriers, Natural killer cells and complement system constitute the second line of defense of the body.
