The T and B lymphocytes are two types of cells inv

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ATI RN Test Bank

The T and B lymphocytes are two types of cells involved in ______?

A. Innate immunity B. Acquired immunity C. Passive immunity D. None of these

Correct Answer: B

Rationale: T and B cells drive acquired immunity ; not innate or passive .

Polymorphonuclear neutrophils attack bacteria:

A. By phagocytosis B. By secreting complement C. By secreting interferon D. Exclusively by oxygen-dependent mechanisms

Correct Answer: A

Rationale: Neutrophils primarily phagocytose bacteria, using both oxygen-dependent and independent mechanisms.

The immunoglobulin found in a mother's milk is

A. IgM B. IgA C. IgE D. IgG

Correct Answer: B

Rationale: IgA is predominant in milk for mucosal protection; IgG is in blood, IgM and IgE are less relevant.

Hypersensitivity reactions:

A. are sometimes mediated by IgE B. may involve immune complexes C. may involve complement, histamine, neutrophils or IgG D. all of the above

Correct Answer: D

Rationale: All (A, B, C) are true: IgE (Type I), complexes (Type III), and complement/IgG (Type II); thus, D.

Which of the following statements is true about TNF alpha?

A. Evoke Th cells B. Induce TGF beta production C. Decrease vascular permeability D. Increases the expression of adhesion molecules

Correct Answer: D

Rationale: TNF-Î± upregulates adhesion molecules; it increases permeability , not decreases.

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