A&P Mastering CH 22 b

Defense of the body against a particular pathogen is provided by immunological surveillance. fever. adaptive immunity. innate immunity. skin defenses.

adaptive immunity

Immunity that results from vaccination against influenza is classified as __________. artificially induced active immunity naturally acquired passive immunity artificially induced passive immunity naturally acquired active immunity

artificially induced active immunity

Which of the following about MHC proteins is false? are found on all nucleated cells fall into two major classes function in antigen presentation bind complement allow the body to differentiate its own cells from foreign cells

bind complement

In passive immunity, the body is deliberately exposed to an antigen. body receives antibodies produced by other humans or by an animal. body receives antibodies produced by other humans. immune system attacks normal body cells. body receives antibodies produced by an animal.

body receives antibodies produced by other humans or by an animal.

A ________ antigen is an antigen with at least two antigenic determinant sites. perfect complete dipolar paired mature

complete

The lymphocytes that enter tissues and directly attack antigens are __________ cells. suppressor T helper T cytotoxic T B cells

cytotoxic T

When an antigen is bound to a Class I MHC molecule, it can stimulate a ________ cell. plasma NK helper T B cytotoxic T

cytotoxic T

CD8 markers are to ________ T cells as CD4 markers are to ________ T cells. helper; suppressor suppressor; cytoxic plasma; NK NK; cytoxic cytoxic; helper

cytoxic; helper

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

helper T

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

helper T

Which class of T lymphocyte is killed by the AIDS virus? cytotoxic T helper T suppressor T NK

helper T

Suppressor T cells act to produce antibodies involved in autoimmunity. erase memory T cells. suppress antigens. inhibit T and B cell activities. limit antigen proliferation.

inhibit T and B cell activities.

Hormones that regulate the activity of B cells and T cells and enhance nonspecific defense are called calcitriol. glucocorticoids. interleukins. mineralocorticoids. immunoglobulins.

interleukins.

Which of the following descriptions is NOT a characteristic of adaptive immunity? intolerance versatility memory specificity

intolerance

Class II MHC molecules are found on which of the following? granulocytes and microphages all body cells with a nucleus lymphocytes and antigen-presenting cells red blood cells liver cells and macrophages in the spleen

lymphocytes and antigen-presenting cells

Adaptive defenses depend on the activities of agranulocytes. monocytes. leukocytes. erythrocytes. lymphocytes.

lymphocytes.

Immunity that results from exposure to an antigen in the environment is called ________ immunity. natural passive passively acquired automatically acquired naturally acquired active innate

naturally acquired active

Immunity that results from antibodies that pass through the placenta from mother to fetus is called ________ immunity. passively acquired naturally acquired passive actively acquired automatically acquired innate

naturally acquired passive

The immune system is said to exhibit ________ toward those agents that do not stimulate an immune response. tolerance adaptation immunity versatility memory

tolerance

The role of antigen-presenting cells in immunity is to activate T cells. bind antigens to glycoproteins. process antigens. display antigen fragments. All of the answers are correct.

All of the answers are correct.

________ occurs when an antigen fragment-glycoprotein complex appears in a plasma membrane. Activation of cytotoxic T cells Inflammation Proliferation of helper T cells Antigen presentation Phagocytosis

Antigen presentation

Steps in antigen presentation include which of these? Antigen fragments appear on the antigen-presenting cell's surface. Antigens are digested. Phagocytic antigen-presenting cells engulf pathogens. Antigen presentation includes all of these steps.

Antigen presentation includes all of these steps.

Cytotoxic T cells can attack target cells with which of the following chemical weapons? secrete mutant proteins that get incorporated into the target's DNA secrete organic solvent secrete strong acid secrete a cytokine that triggers apoptosis secrete free radicals

secrete a cytokine that triggers apoptosis

Interleukins do all of the following except stimulate collagen synthesis. increase T-cell sensitivity to antigens exposed on macrophage membranes. stimulate inflammation. elevate body temperature. stimulate B-cell activity, plasma cell formation, and antibody production.

stimulate collagen synthesis.