OVERVIEW OF THE IMMUNE SYSTEM
THE GOOD BAD AND UGLY OF THE IMMUNE SYSTEM
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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helper T cell
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mast cell
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cytotoxic T cell
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plasma cells
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Detailed explanation-1: -Dendritic cells (DCs) and macrophages in the medulla bind the antigen, and some can activate the complement pathway. Then there are multiple possible pathways: (1) Opsonized antigen can be released and bound by B cells through CR2, which transports the antigen to the FDC.
Detailed explanation-2: -These two lymphocytes originate from a common precursor, yet are fundamentally different with B cells mediating humoral immunity while T cells mediate cell mediated immunity. In cytokine production, naïve T cells produce multiple cytokines upon activation while naïve activated B cells do not.
Detailed explanation-3: -APCs also secrete cytokines such as IL-12, IL-4, and IL-23, which are potent differentiation factors into the Th1, Th2, or Th17 phenotypes, respectively, of CD4+ T helper cell populations and therefore APCs regulate and direct the T cell response.
Detailed explanation-4: -TH1 helper cells release a molecule that activates a type of cell called a macrophage. Macrophages are specialized cells that help eliminate foreign substances from your body. TH1 cells also activate cytotoxic T-cells. TH2 helper cells release molecules that activate B-cells.