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Questions and Answers
B lymphocytes and T lymphocytes are located in the same area within a primary lymphoid organ (PLO).
False
The segregation of B and T lymphocytes allows for tight regulation and development of immune cells through chemokines from dendritic cells.
True
B lymphocytes express the CXCR7 receptor, while T lymphocytes express the CCR5 receptor.
False
Lymphocytes activate and migrate towards the edge of the follicle.
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Helper T cells interact with B cells to differentiate them into red blood cells.
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Natural Killer Cells recognize and kill infected cells by secreting the cytokine IFN - α.
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Mast Cells are activated by microbial products binding to TLRs in the cytoplasmic granules.
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Innate Lymphoid Cells (ILCs) express T cell antigen receptors for antigen recognition.
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Th2 cells are induced by extracellular bacteria and fungal infections.
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Helper T cells interact with Natural Killer Cells to enhance the killing of infected cells.
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Activated Mast Cells release histamines that cause vasoconstriction and reduce capillary permeability.
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Neutrophils are the first to respond to most infections, but they do not provide prolonged defense.
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Monocytes/Macrophages are able to differentiate into two distinct pathways: Classical Macrophage Activation and Alternative Macrophage Activation.
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Dendritic cells only produce cytokines in response to microbes, but they do not respond to microbes in any other way.
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Intraepithelial T lymphocytes are not considered part of the innate immune system.
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The complement system, which includes products of complement activation, is not part of the innate immune system.
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Monocytes/Macrophages have a higher circulating count than neutrophils in the blood.
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