Complement c3b protein coats bacteria and stimulates phagoeytosis by in a proces

Question

Complement c3b protein coats bacteria and stimulates phagoeytosis by in a process called A. lymphocytes and monocytes; opsonization B. neutrophils and macrophages; cytolysis C. mast cells and basophils; opsonization D. neutrophils and macrophages; opsonization 9) Helper T (T) cells recognize antigens when they are bound to a(n) A. hapten. B. immunoglobulin. C. natural killer cell. D. major histocompatibility complex (MHC) protein. 10) This is the correct sequence of events in the humoral immune response. A. antigen recognition antigen presentation -> differentiation +clonal selection- attack B. antigen recognition antigen presentation clonal selection ->differentiation- attack antigen presentation antigen recognition clonal selection-> differentiation attack D. antigen presentation->antigen recognition clonal selection- attack differentiation 11) Cytotoxic T (Tc) cells are like a natural killer (NK) cell because they both A. secrete interferons. B. secrete granzymes and perforin. C. participate in the immune response. D. participate in nonspecific resistance. constitutes about 80% of circulating antibodies in plasma. 12) A. IgG B. IgE C. IgA D. IgM Respiratory Questions: 13) Which of the following is not a function of the respiratory system? A. It controls the pH of body fluids. B. It promotes the flow of lymph and venous blood. C. It helps regulate blood pressure. D. It assists in the synthesis of vasodilators. 14) The rate of oxygen diffusion is affected by the pressure gradient of carbon dioxide. (True or False)

Explanation / Answer

8) d

neutrophil and macrophages; opsonization

Neutrophils and monocytes are type of lymphocytes that cause phagocytosis by a process called opsonization.

Complement c3b protein coats bacteria and stimulates phagocytosis.ingestion of bacteria or other material by phagocytes that are neutrophils and macrophages by process of opsonization where the partcle is identified by phagocyte and then its destruction.

9)d

Major histocompatibility complex proteins (MHC)

It determines the histocompatibility.its main function is to bind to antigen surface for recognition of t cell.so we can say that helper t cell can recognize antigen only when it is bound to major histocompatibility complex.

10)c

Antigen presentation -antigen recognition- clonal selection- differentiation-attack

First antigen is presented when it binds to mhc Protein s the helper t cell recognizes the antigen more b cells are produce antibody they differentiate and thy finally attack the antigen.

11)c

Both of them participate in innate immune system. The serve as first line of defence against foreign pathogen.they express t cell receptor that recognizes antigen.

12)a

IgG

Is the most abundant antibody it constitutes 80 percentage of bodies antibody.it is very important antibody of our body .it is found in breast milk.

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