Which of the following are true for complement system in invoking defense against pathogens? Select all that apply. Responses It is involved in pathogen recognition and destruction. It is involved in pathogen recognition and destruction. It consists of insoluble proteins that activate the blood coagulation system. It consists of insoluble proteins that activate the blood coagulation system. Its components form a membrane-attack complex (MAC). Its components form a membrane-attack complex (MAC). It is a system of soluble plasma proteins. It is a system of soluble plasma proteins.
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Complete the following statements about the complement system and nonspecific immunity. Not all choices will be used. The complement system is composed of proteins in the blood plasma that are activated when pathogens enter the body. Bacteria-infected cells can activate the complement system. The protein "complement" is involved in immune responses by attracting and enhancing phagocytosis. Other proteins join to form a complex structure that punches holes in the cell walls of pathogens and causes them to burst. Natural killer cells can kill infected cells and tumor cells by cell-to-cell contact. Lymphocytes and macrophages are involved in the immune response. The complement system can also be activated by pathogens.
Madhur L.
Which of the following is not true regarding the complement system? Answer: This system involves a group of at least 20 proteins found in the blood plasma. During an infection, one protein in this system activates the next in a cascade of reactions. Some components of this system stimulate eosinophils to release histamine. Activated components of this system adhere to bacterial cell walls and then create holes in these cell walls. Some components of this system stick to the walls of bacterial cells, marking them for phagocytosis.
Adi S.
Which of the following is false regarding complement? Is composed of at least 30 circulating blood proteins Circulates in the blood in an inactive form when no active infection is occurring Acts in a cascade reaction when activated by a pathogen Results in the formation of holes on the surface of pathogens resulting in their lysis All of the above are true regarding complement
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