Lsn 14, VAP 20.15 - 20.21

Immunoglobulins that are primarily found in glandular secretions such as mucus, saliva, and tears are IgA. IgD. IgE. IgG. IgM.

IgA

Immunoglobulins that attach to and sensitize mast cells and basophils are IgA. IgD. IgE. IgG. IgM.

IgE.

Immunoglobulins that are most abundant and are responsible for resistance against many viruses, bacteria, and bacterial toxins are IgA. IgD. IgE. IgG. IgM.

IgG

Which class of antibodies is secreted first after an antigen is encountered? IgE IgA IgM IgG

IgM

________ cells enable the immune system to respond quickly and robustly if the same antigen is encountered a second time. Dendritic Suppressor Plasma IgM Memory

Memory

Inappropriate or excessive immune responses to antigens are the result of stress. autoimmune diseases. immunodeficiency diseases. signs of a weak system. allergies.

allergies.

An allergen circulating in the bloodstream affects mast cells throughout the body, dropping blood pressure to dangerously low levels. This response is termed allergic rhinitis. anaphylactic shock. asthma. hypersensitivity. allergy.

anaphylactic shock.

Helper T cells do all of the following except activate sensitized B cells by costimulation. destroy target cells using perforins. secrete cytokines to stimulate production of plasma cells. enhance cell-mediated immunity. enhance antibody-mediated immunity.

destroy target cells using perforins.

Cells that help regulate the antibody-mediated immune response are ________ cells. cytotoxic T B plasma helper T NK

helper T

The human immunodeficiency virus (HIV), which causes the disease known as AIDS, selectively infects ________ cells. helper T cytotoxic T suppressor T plasma B

helper T

Destruction of antigens or cell lysis can be caused by all of the following except complement system. antibody actions. cytotoxic T cells. macrophages. helper T cells.

helper T cells.

Infection with the HIV virus occurs through casual contact with an infected individual. intimate contact with an infected person's body fluids. airborne droplets from coughs and sneezes. sharing clothes with an infected individual. eating contaminated food.

intimate contact with an infected person's body fluids.

Antibodies may bind to superficial sites on bacteria or other toxins, making the toxin incapable of attaching itself to a cell. This mechanism is known as phagocytosis. costimulation. neutralization. opsonization. agglutination.

neutralization.

A test to measure the antibody level a blood sample is called a(n) primary response. secondary response . titer. major histocompatibility complex. anaphylaxis test.

titer.

Which statement regarding CD4 T cells is true? -Upon activation, CD4 T cells undergo a series of divisions, and daughter cells differentiate into active cytotoxic T cells and suppressor T cells. -A CD4 T cell can recognize antigens bound to Class I MHC proteins. -Prior to differentiating into an active helper T cell, a CD4 T cell must first encounter a suppressor T cell. -Before they can initiate antibody-mediated immunity, inactive CD4 T cells must be exposed to appropriate antigens bound to Class II MHC proteins.

-Before they can initiate antibody-mediated immunity, inactive CD4 T cells must be exposed to appropriate antigens bound to Class II MHC proteins.

________ will develop when the immune response mistakenly targets normal body cells and tissues. Autoimmune disorders Acquired immune deficiency syndrome Anaphylaxis Immunosuppression Allergies

Autoimmune disorders

T cells release cytokines to stimulate the activation of antibodies. plasma cells. immunoglobulins. APCs. B cells.

B cells.

When an antigen is bound to a Class II MHC protein, it can activate a(n) ________ cell. plasma CD4 T suppressor T NK cytotoxic T

CD4 T

Which mechanism results in a coating of antibodies and complement proteins that increases the effectiveness of phagocytosis? opsonization neutralization agglutination activation of complement

opsonization

B cells prepare for activation by presenting an antigen bound to Class II MHC proteins in a process called customization. sensitization. apoptosis. differentiation. opsonization.

sensitization.