05 Jan b. cytotoxic T cells.

Question 1

2.50 points out of 2.50

Question text

Transplanted tissues and organs that contain _________ _________ are rejected by the body.

Select one:

a. self-antigens

b. foreign antigens

c. foreign antibodies

d. self-antibodies

e. plasma proteins

Question 2

2.50 points out of 2.50

Question text

B-cells

Select one:

a. are a subset of T cells.

b. when activated become plasma cells and produce antibodies.

c. are responsible for forming all the body’s memory cells.

d. suppress the activity of T cells.

e. mature in the thymus.

Question 3

2.50 points out of 2.50

Question text

Which of the following is NOT a secondary lymphatic organ?

Select one:

a. spleen

b. lymph node

c. lymphatic nodule

d. thymus gland

Question 4

2.50 points out of 2.50

Question text

Which of the following is ly matched?

Select one:

a. IgA – found in saliva and tears

b. IgD – can cross the placenta

c. IgG – first to challenge the antigen

d. IgM- binds to mast cells and basophils to stimulate inflammation

e. IgE – transfusion reactions

Question 5

2.50 points out of 2.50

Question text

Which of the following is usually the first cell type to leave the blood and enter infected tissues?

Select one:

a. eosinophil

b. lymphocyte

c. monocyte

d. natural killer cell

e. neutrophil

Question 6

2.50 points out of 2.50

Question text

In systemic inflammation, pyrogens

Select one:

a. decrease phagocytosis.

b. decrease vasodilation.

c. increase neutrophil production.

d. stimulate fever production.

e. are chemotaxic factors.

Question 7

2.50 points out of 2.50

Question text

Lymphocyte activation can occur in several ways. However, in all cases

Select one:

a. lymphocytes must recognize an antigen.

b. helper T cells are activated first and they then stimulate other cells.

c. antigen-presenting cells process the antigen and present it to the lymphocytes.

d. cytokines released by the antigen stimulate the lymphocyte response.

e. antigens must be able to recognize the lymphocytes.

Question 8

2.50 points out of 2.50

Question text

MHC class II molecules are found on

Select one:

a. neutrophils, monocytes, and macrophages.

b. dendritic cells, B cells, and helper T cells.

c. monocytes, helper T cells, and neutrophils.

d. B cells, macrophages, and dendritic cells.

e. B cells, C cells and D cells.

Question 9

2.50 points out of 2.50

Question text

Which of the following substances DOES NOT cause increased capillary permeability, chemotaxis, and vasodilation?

Select one:

a. cytokines

b. protaglandins

c. leukotrienes

d. complement

e. histamine

Question 10

In

0.00 points out of 2.50

Question text

Which is the proper order of events in cell-mediated immunity?

(1) cloning of cytotoxic T cells and memory T cells

(2) antigen presented to T lymphocyte

(3) activation of T lymphocytes

(4) cytotoxic T cells attack target cells

Select one:

a. 2, 3, 4, 1

b. 1, 4, 2, 3

c. 2, 3, 1, 4

d. 3, 2, 4, 1

e. 1, 2, 3, 4,

Question 11

2.50 points out of 2.50

Question text

____ are part of cell-mediated immunity while ____ are part of antibody-mediated immunity.

Select one:

a. B cells, NK cells

b. Antibodies, antigens

c. T cells, B cells

d. Macrophages, antibodies

e. Neutrophils, monocytes

Question 12

2.50 points out of 2.50

Question text

Once cytotoxic T cells are produced, which of the following is (are) consistent with their ability to attack intracellular viruses?

Select one:

a. Most nucleated cells process antigens through the MHC class I mechanisms.

b. Viral antigens are processed by the MHC class I mechanism and are presented to the cell surface.

c. Cytotoxic T cells bind to MHC class I processed antigens.

d. Cytotoxic T cells bound to the MHC class I processed antigens release lymphokines.

e. All of these choices are .

Question 13

2.50 points out of 2.50

Question text

Which of the following is a subpopulation of T cells?

Select one:

a. cytotoxic

b. antigenic

c. cytokinetic

d. basophilic

e. antitoxic

Question 14

2.50 points out of 2.50

Question text

In the cell-mediated immune response, T cells secrete ___, which activate additional components of the immune system.

Select one:

a. antibodies

b. complement

c. collagen

d. cytokines

e. histamine

Question 15

2.50 points out of 2.50

Question text

The diagram illustrates the stimulation and effects of T cells. What does “A” represent?

Select one:

a. memory T cells

b. cytotoxic T cells

c. contact killing

d. lysis of target cell

e. release of cytokines

Question 16

2.50 points out of 2.50

Question text

Lymphocyte proliferation begins by increasing the number of

Select one:

a. macrophages.

b. B cells.

c. T suppressor cells.

d. helper T cells.

e. cytotoxic T cells.

Question 17

2.50 points out of 2.50

Question text

Antibodies secreted in breast milk

Select one:

a. are IgG antibodies.

b. are IgA antibodies.

c. provide natural active adaptive immunity.

d. include the cytokine interleukin 2.

e. promote inflammation.

Question 18

2.50 points out of 2.50

Question text

Which of the following would be classified as an innate physical barrier?

Select one:

a. activation of complement

b. phagocytosis of invading organisms

c. washing action of tears and saliva

d. inflammation

e. release of histamine

Question 19

2.50 points out of 2.50

Question text

The inflammatory response

Select one:

a. prevents the spread of an infection.

b. stimulates erythrocytes to leave the blood.

c. delays healing of damaged tissues.

d. depresses immunity.

e. is harmful and should be immediately reversed.

Question 20

2.50 points out of 2.50

Question text

The effects of cell-mediated immunity are the result of activities of

Select one:

a. B cells.

b. cytotoxic T cells.

c. macrophages.

d. dendritic cells.

e. helper T cells.