Answer :
Final answer:
Among the major complement system pathways, the classical pathway was discovered first. It is activated by antibodies bound to antigens. The discovery of the other two pathways expanded our understanding of the immune system.
Explanation:
The complement system is a crucial part of the immune system, composed of a group of proteins that work together to destroy foreign invaders, trigger inflammation, and get rid of debris within the body. Among the major pathways of the complement system, the classical pathway was discovered first. This pathway is usually activated by antibodies that are bound to antigens, such as bacteria or viruses. The late discovery of the other two pathways - the alternative pathway and the lectin pathway, expanded our understanding of this intricate immune system. Further studies on these pathways are being conducted to explore their role in immune responses and potential in medical applications.
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