What activates the complement system quizlet?

The classical pathway is initiated by activation of the C1 complex. >If directly binding to pathogen surface: C1 binding to C-reactive protein on the pathogen surface activates the classical pathway of complement fixation (exception to adaptive initiation).

How are complement proteins activated quizlet?

What is the Classical Pathway or Specific Complement System activation? By a specific immune response when IgG or IgM binds to Ag at the surface of a pathogen (or as complexes). The Ab that is bound to the pathogen can activate complement protein via C1 binding the Fc part of the Ab.

How and why complement system is activated?

The complement system is made up of a large number of distinct plasma proteins that react with one another to opsonize pathogens and induce a series of inflammatory responses that help to fight infection. The complement system activates through a triggered-enzyme cascade.

What is an effect of the activation of the complement system quizlet?

During complement activation: Act on blood vessels to increase vascular permeability, which allows increased fluid and protein leakage from the vessels. Also results in migration of monocytes and neutrophils from blood into tissue. Microbicidal activity of macrophages and neutrophils is increased.

What occurs with complement activation?

The end result of this complement activation or complement fixation cascade is stimulation of phagocytes to clear foreign and damaged material, inflammation to attract additional phagocytes, and activation of the cell-killing membrane attack complex.

What activates the classical complement pathway?

The classical complement pathway is activated by antibody–antigen complexes on the bacterial surface and has been considered predominately to be an effector of the adaptive immune response, whereas the alternative and mannose-binding lectin pathways are activated directly by bacterial cell surface components and are …

Which complement pathway is activated by antibodies quizlet?

1. The classical pathway is triggered by antibodies bound to antigens on the microbial surface. 2. The alternative pathway is triggered directly by bacterial cell surfaces.

What are the 3 outcomes of complement activation?

Its activation results in three major potential outcomes for microbes: cell lysis upon assembly and insertion of the terminal membrane attack complex (MAC), complement mediated opsonization, and the release of anaphylatoxins that enhance local inflammation.

What is the role of complement?

The complement system is a crucial mediator of the innate immune response, contributing to cell homeostasis, tissue development, and repair, reproduction, and cross-talk with other endogenous systems.

What happens when the complement system gets activates quizlet?

C3d generated when complement is activated by an antigen can bind CR2 receptor on B lymphocytes and enhance antigen-induced signaling in B cells.

What are the three effects of complement activation?