* not completed

. Which of the following statements regarding the natural immune system is correct?

Neutrophils can only destroy bacteria circulating in the blood. correct incorrect

Macrophages use nitrous oxide to kill bacteria they have engulfed. correct incorrect

Complement kills bacteria prior to their uptake by phagocytes. correct incorrect

The monocytes of the blood are the precursors of tissue macrophages. correct incorrect

* not completed

. Which of the following statements regarding the inflammatory response is correct?

Tissue swelling is the first stage of the inflammatory response. correct incorrect

Mast cells secrete chemotactic agents that attract lymphocytes correct incorrect

Macrophages secrete vasoactive materials during the inflammatory response correct incorrect

The inflammatory response can be triggered by antibody binding to the surface of micro-organisms. correct incorrect

* not completed

. Which of the following statements regarding the lymphocytes is correct?

The lymphocytes are the most abundant white cells of the blood. correct incorrect

Lymphocytes normally migrate through the tissues as part of immune surveillance correct incorrect

B lymphocytes respond to antigens in the extracellular fluid correct incorrect

All B lymphocytes become plasma cells after they have been stimulated correct incorrect

* not completed

. Which of the following statements regarding the functions of T lymphocytes is correct?

T lymphocytes mature in the thyroid gland correct incorrect

All T cells secrete cytotoxic materials correct incorrect

T cells respond to foreign proteins on the surface of host cells correct incorrect

T cells secrete IgG when they are activated correct incorrect

* not completed

. Natural killer (NK) cells only destroy cells infected with a virus.

True correct incorrect

False correct incorrect

* not completed

. Which of the following statements about antibodies is correct?

The antigen receptor on a lymphocyte has the same specificity as the antibody it secretes correct incorrect

IgM crosses the placenta and provides a fetus with antibody protection correct incorrect

B lymphocytes secrete IgM in response to a first infection correct incorrect

Antibody molecules have two identical antigen binding sites in the Fc region correct incorrect

* not completed

. The inflammatory response can be triggered by complement binding to the surface of micro-organisms.

True correct incorrect

False correct incorrect

* not completed

. B lymphocytes mature in the bone marrow

True correct incorrect

False correct incorrect

* not completed

. B lymphocytes secrete IgA into the plasma when they are first activated

True correct incorrect

False correct incorrect