THE HUMAN IMMUNE SYSTEM
IMMUNE RESPONSE
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Helper T cells pick up information about the specific pathogen
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B cells produce antibodies
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Killer T cells destroy more pathogens
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Nothing
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Detailed explanation-1: -Once stimulated by the appropriate antigen, helper T cells secrete chemical messengers called cytokines, which stimulate the differentiation of B cells into plasma cells (antibody-producing cells).
Detailed explanation-2: -Helper T cells become activated by interacting with antigen-presenting cells, such as macrophages. Antigen-presenting cells ingest a microbe, partially degrade it, and export fragments of the microbe-i.e., antigens-to the cell surface, where they are presented in association with class II MHC molecules.
Detailed explanation-3: -After binding to the antigen and MHC class II molecule presented by the dendritic cell, the naïve helper T cell becomes activated and proliferates. Instead of gaining the ability to kill infected cells, helper T cells acquire the ability to activate cells that bear MHC class II molecules.
Detailed explanation-4: -Phagocytosis: Once a macrophage engulfs a virus (1-3), it’s broken down with enzymes from the lysosomes (4, 5) then released from the cell as harmless waste material (6).