21. The Immune System

Cytotoxic T cells are primarily involved in ____________.

Name the five antibody classes and describe where each is most likely to be found in the body.

Which of the following is not a role of T_H cells?

a. Stimulation of macrophages

b. Activation of naïve T_C cells

c. Stimulation of naïve B cells

d. Stimulation of clonal selection

More than one choice may apply.

Which of the following antibody capabilities causes a transfusion reaction with A or B erythrocyte antigens?

a. Neutralization

b. Precipitation

c. Complement fixation

d. Agglutination

The specificity of an antibody is determined by the

(a) Fixed segment

(b) Antigenic determinants

(c) Variable region

(d) Size of the antibody

(e) Antibody class

The secondary lymphoid organs:

What major advantage is conveyed by having a system of adaptive immunity?

Which of the following is not involved in the activation of a B cell?

a. Antigen

b. Helper T cell

c. Cytokine

d. Cytotoxic T cell

Explain how active immunity and passive immunity differ.

Define antibody. Using an appropriately labeled diagram, describe the structure of an antibody monomer. Indicate and label variable and constant regions, heavy and light chains.

Match the following antibodies with the correct definition.

____IgD     

____IgM     

____IgG     

____IgA     

____IgE

a. Antibody found in secretions

b. Most common antibody; crosses the placenta

c. Antibody involved in allergies and parasitic infections

d. Pentamer and potent agglutinating agent

e. Antibody bound to the B cell plasma membrane