Select all that applyWhat can activate complement?Multiple select question.Pathogen surface moleculesMBL proteinPhagocytosis
Question
Select all that applyWhat can activate complement?Multiple select question.Pathogen surface moleculesMBL proteinPhagocytosis
Solution
The complement system can be activated by several factors. Here are the options that apply:
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Pathogen surface molecules: Yes, these can activate the complement system. The complement system is part of the immune system that enhances (complements) the ability of antibodies and phagocytic cells to clear microbes and damaged cells from an organism, promote inflammation, and attack the pathogen's cell membrane.
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MBL protein: Yes, this can activate the complement system. Mannose-binding lectin (MBL) is a collectin that binds to sugar molecules on the surfaces of many pathogens and can trigger the lectin pathway of the complement system.
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Phagocytosis: No, this does not activate the complement system. Phagocytosis is a process used by immune cells to engulf and destroy pathogens, but it does not directly activate the complement system. However, the products of the complement system can enhance phagocytosis, a process known as opsonization.
Similar Questions
Select all that applyWhich of the following are true of complement?Multiple select question.Its component proteins usually circulate freely in the blood plasma in inactive form.It is comprised of a group of proteins that are normally produced in all of the potential routes of entry for microbes.It is the main defense system of invertebrates.It is comprised of approximately 30 proteins.
Which of the following are potential outcomes following complement activation?SELECT ALL THAT APPLYGeneration of antimicrobial peptidesApoptosis of virus-infected cellsInduction of a memory response by B and T cellsOpsonization of pathogens for phagocytosisCytolysis of pathogens through formation of the membrane attack complex (MAC)Induction of an inflammatory response
The complement system consists of over 30 different proteins that work together in a cascade fashion to protect us against infectious agents. One way this system is activated is via the __________, when complement proteins are activated by directly interacting with a pathogen.ANSWERclassical pathwaycomplement pathwaylectin pathwayalternative pathway
Which of the following is NOT an effect of complement activation?Group of answer choicesBacterial cell lysisInterference with viral replicationOpsonizationIncreased phagocytic activityIncreased blood vessel permeability
What functions can complement proteins perform?Group of answer choicesprovide immunity in response to immunizationstore "memories" of specific antigens for months or yearsbind Fc receptorscoat invading microbesattract phagocytes to the site of infectioninsert themselves into the foreign cell's plasma membraneamplify the inflammatory response
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