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Immune System Function and Immunodeficiency Quiz

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Immune System Function and Immunodeficiency Quiz

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Questions and Answers

What is the mechanism by which HIV enters T-helper cells?

By binding to the CD4+ receptor and releasing viral RNA into the bloodstream

By binding to the CD4+ receptor and inserting viral RNA into the host cell (correct)

By binding to the CD8+ receptor and inserting viral RNA into the host cell

By binding to the CD8+ receptor and releasing viral RNA into the bloodstream

Which of the following is a characteristic of Type I Immediate Hypersensitivity (Allergy)?

Occurs in organs exposed to the environment (correct)

Triggers release of cytokines from macrophages

Is caused by cytotoxic T cells

Stimulates IgA producing plasma cells

What is the result of the decreased thymic hormone levels associated with aging?

Stimulation of B-cell proliferation

Increase in inflammatory response

Enhanced spread of infection

Decrease in cell-mediated immunity (correct)

Which of the following represents an effect of stress on the immune system?

Decreased functioning of thymus through secretion of glucocorticoids from adrenal gland (C) Signup and view all the answers

What is the defining characteristic of Acquired Immune Deficiency Syndrome (AIDS) according to CDC guidelines?

CD4+ T-cell count (B) Signup and view all the answers

Which type of immunodeficiency is characterized by moderate to marked reduction in IgA, leading to infections in areas covered with mucosal secretions?

Selective IgE deficiency (D) Signup and view all the answers

What gene defect is associated with Thymic hypoplasia (DiGeorge Syndrome), causing primary T-cell deficiency due to developmental malformation of thymus gland?

Deletion on chromosome 22 (D) Signup and view all the answers

Which type of immunodeficiency is characterized by hypogammaglobulinemia due to blocked maturation of B-cells, resulting in recurrent ear, sinus, and respiratory infections?

Common variable immunodeficiency (C) Signup and view all the answers

What type of immune abnormalities result in abnormal immunoglobulin synthesis or maturation deficiency of immunoglobulin?

B-lymphocyte immune abnormalities (A) Signup and view all the answers

Which type of immunodeficiency is characterized by an inability to clear infections, leading to recurrent ear, sinus, and respiratory infections?

Common variable immunodeficiency (D) Signup and view all the answers