Which of the following is true about complement? Check all that apply. Three pathways of complement, where classical and alternative, are activated by antibodies and lectin by spontaneous hydrolysis of C3 Complement pathways are activated in response to infections and involved in opsonization, phagocytosis and lysis of microbes The"b" subunit of complement such as C3b or  C5b is deposited on the microbes, whereas the "a" subunit, C3a or C5a recruits phagocytic cells to the site of infection and promotes inflammation Alternative pathway is activated immediately due to presence of C3b because of spontaneous hydrolysis of C3, whereas classical pathways in several days after secretion of pathogen-specific antibodies Seven complement(C) proteins are made by liver and C5 is found in abundance

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Immunology

Immunology is the division of science involved with the immune reactions occurring in living organisms. The organisms are accustomed to evolving internal defense mechanisms to evade the invasion of microbial pathogens. Diverse cells are connected with stimulating the immune responses, which produce inhospitable conditions to the microbes prompting their lysis and thus inhibits the multiplication of the pathogens. The immune system can distinguish the pathogens through the aid of cellular intercommunication and launch responses to destroy them.