Which of the following system's job is to protect

ATI RN

ATI RN Test Bank

Which of the following system's job is to protect our body against disease-causing microbes?

A. Digestive system B. Immune system C. Excretory system D. Respiratory system

Correct Answer: B

Rationale: Immune system defends against microbes; others (A, C, D) don't.

Which of the following is not an acute phase protein:

A. Chondroitin sulfate B. C-reactive protein C. Fibrinogen D. Mannose binding lectin

Correct Answer: A

Rationale: Chondroitin sulfate is a structural molecule, not an acute phase protein like CRP or fibrinogen.

Which of the following actually kills invading microbes?

A. lysozymes B. stomach acid C. intestinal enzymes D. all of the above

Correct Answer: D

Rationale: Lysozymes degrade bacterial walls, stomach acid kills via pH, and intestinal enzymes digest microbes; all kill invaders.

Cytotoxic T cells are called into action by the:

A. presence of interleukin-1 B. presence of interleukin-2 C. presence of neutrophils D. decrease in the number of B cells

Correct Answer: B

Rationale: IL-2 activates cytotoxic T cells; IL-1 is broader, neutrophils are innate.

Which of the following does not occur during the lag period of the primary antibody response?

A. activation of helper T cells B. class switching to IgG C. presentation of antigen with MHC II D. binding of antigen to BCRs

Correct Answer: B

Rationale: Class switching occurs later; activation , presentation , and binding happen in lag.

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