Discussion
Which of the following blood proteins can destroy pathogens?
Answer: D
Correct answer: Complement system
The complement system is a cascade of some thirty plasma proteins. Once triggered - by antibody bound to a surface, or directly by microbial surfaces - it opsonises the pathogen for phagocytosis, recruits inflammatory cells, and assembles the membrane attack complex that punches a hole in the microbe and lyses it. Fibrinogen is for clotting, platelets are cell fragments, and MHC molecules present antigen rather than destroying it.
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