The complement system is the innate defense mechanism that initiates a cascade effect in response to foreign proteins in the body.
The complement system is apart of the immune system that promotes or activates inflammation, participates in opsonization of foreign particles and is involved in direct killing of invaders. There are three pathways of complement system: classical pathway, alternative pathway, and lectin pathway.
Innate immunity is the non-specific type of immunity. It is present inside an organism by birth. It is also known as the first line of defense. It exhibits similar reaction to all kind of foreign particles.
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