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Lymphatic vessels are located in almost all portions of the body, except the


Histamine increases blood flow and vascular permeability. This would account for all of the following changes that occur during inflammation, except

chemotaxis of phagocytes.

Which of these is not a property of an IgG heavy chain?

binds antigen at both ends

All of the following are true of the secondary response of humoral immunity, except that it

weakens quickly because memory B cells only survive for a year or two.

________ are clusters of lymphoid nodules deep to the epithelial lining of the small intestine.

Peyer patches

Suppressor T cells act to

inhibit T and B cell activities.

Each IgG has ________ binding sites for attachment to antigenic determinants.



respond to antigens

The following are steps in the cell-mediated immune response.

2, 4, 1, 5, 3, 6.

Inappropriate or excessive immune responses to antigens are


Which of these statements about lymph flow in a node is false?

the afferent lymphatics enters at the hilum

T cells and B cells can be activated only by

exposure to a specific antigen at a specific site in a plasma membrane.

Class II MHC molecules are found only on which of the following?

lymphocytes and antigen-presenting cells

T is to ________ as B is to ________.

thymus-dependent; bone marrow-derived

Immunoglobulins, formed of five subunits, that are the first antibodies to be produced in response to infection, are


The lymphoid system does all of the following, except that it

transports gases to and away from lymph nodes.

The term lymphadenopathy refers to

a chronic or excessive enlargement of lymph nodes.

Each of the following is a physical barrier to infection, except


Defense of the body against a particular pathogen is provided by

specific immunity.

The classic pathway of complement activation begins when the protein C1 binds to

an antibody attached to an antigen.

Immunity that is genetically determined and present at birth is called ________ immunity.


Stem cells that will form T cells develop in the


In order for a lymphocyte to respond to an antigen, the antigen must

bind to specific receptors on the lymphocyte surface.

Which of the following statements about MHC proteins is not true?

bind complement

Helper T cells do all of the following, except

provide a rapid response to a future exposure to the antigen.

Inappropriate or excessive immune responses to antigens are


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