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Answer :
Final answer:
The presence of an antigen-antibody complex on a pathogen's surface, primarily in the classical pathway of the complement system, significantly accelerates the deposition of C3b on pathogens. This is crucial for the body's innate immune response and phagocytic destruction of the pathogen.
Explanation:
The factor that speeds up C3b deposition on the surfaces of pathogens is the presence of an antigen-antibody complex, specifically in the classical pathway of the complement system. When antibodies attach to antigens on the pathogen's surface, they change shape and provide a binding site for the C1 complement protein.
This triggers the cleavage of complement components C2 and C4, leading to a cascade of events that results in the rapid coating of the pathogen in complement proteins including the deposition of C3b. This process is an integral part of the body's innate immune response and is critical for tagging pathogens for destruction by phagocytes.
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