Need all answers please Need all answers please 0 In cell mediated immunity 8 ce

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Need all answers please Need all answers please 0 In cell mediated immunity 8 cells produce antibodies bPlasma cells produce antibodies C T oeills attack self-antigens d. T cells attach to antigens on surface of pathogen and destroy them 11 8 cells differentiate into cells and secrete a Plasma; antigens b. Plasma; antibodies Tcells antibodies d Antibodies; plasma 12 Newborns acquire immunity from mother is a form ofimmunity a Active b Passive c. innate d Adaptive 13. A primary immune response and a secondary immune response a Is very rapid, doesn't protect body defenses b. Produces antibodies within 30-20 days after exposure to antigen; produces antibodies within a da after exposure to same antigen c Occurs only in children occurs only in adults d. Produces immediate antibodies after exposure to antigen, doesnt produce antibodies 14. Normal immune response requires: d. None of above 15. As result of allergen-antibody reaction cels release a. Mast;cytokines b. Mast; histamine c. Blymphocytes ; histamine d. Tlymphocytes; cytokines 16. There are classe ofinmunog?obulns: c 4 17 is an antigen presenting cell that stimulates cells: a Tcell: b. Macrophage T c Macrophage:8 d. T cell; macrophage

Explanation / Answer

10. Cell mediated immunity is not mediated by antibodies but instead it involves the activation of antigen specific T cells. These activated T cells release cytokines that destroys the pathogen. So, the correct option is option D, T cells attach to antigens on surface of pathogen and destroy them.

11. Adaptive immune response is specific immune response that is generated against antigen/ Adaptive immune response is of two types: Humoral immune response mediated by B cells and cell mediated immune response mediated by T-cells. In humoral immune response B cells upon antigenic activation, differentiate into plasma cells and secrete antibodies. So, the correct option is option B, plasma; antibodies.

12. Immunity is of two types – active immunity and passive immunity. Active immunity is the long term immunity that develops due to exposure to the pathogen. Passive immunity on the other hand is a short term immunity that is due to the transfer of pre formed antibodies. For example, transfer of antibodies from mother to new born through mother’s milk is an example of passive immunity. So, the correct option is option B, passive.

13. Immune response that is elicited during the first time encounter with an antigen is known as primary immune response. During primary immune response, antigen specific B cells are activated. These activated B cells differentiate into plasma cells and memory cells. Plasma cells produce antibodies that eliminate the pathogen while memory B cells retain the memory of the antigen. These memory cells upon encounter with the same antigen for a second time differentiate to form plasma cells and memory cells. Plasma cells produce antibodies and eliminate the pathogen. This is known as secondary immune response. Primary immune response takes a longer time to produce antibodies against the antigen while secondary immune response against the antigen is rapid due to the presence of memory B cells. So, the correct option is B, produces antibodies within 10-20 days after exposure to antigen, produces antibodies within a day after exposure to the same antigen.

14. Adaptive immune response requires both T cells and B cells. B cells mediate humoral immune response and T cells mediate cell mediated immune response. So, the correct option is option C, Both B and T lymphocytes.

15. Hypersensitivity reactions or allergic reactions occur due to an abnormal reaction of the immune system to an antigen or allergen. Due to allergen-antibody (IgE) reaction, degranulation of mast cells occurs resulting in the release of vasoactive amines like histamine and serotonin that mediate the inflammatory reactions of hypersensitivity. So, the correct option is option B, mast; histamine.

16. Immunoglobulins also known as antibodies are produced by antigen stimulated B cells. There are 5 classes of immunoglobulins: IgM, IgG, IgA, IgD, and IgE. So, the correct option is option D, 5.

17. Antigen presenting cells are cells of the immune system that process and present antigens for recognition by T cells thereby mediating cellular immune response. Examples of antigen presenting cells include – macrophages, B-cells, dendritic cells, Langerhans cells. So, the correct option is option B, macrophage; T.

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