Chapter 20 - next2eden.net

Active Lecture Questions

CHAPTER

20

The Lymphatic System and Lymphoid Organs and Tissues Copyright © 2010 Pearson Education, Inc.

Lymphatic vessels:

a. collect excess fluid from interstitial spaces.

b. drain blood from lymph nodes. c. are part of the venous system.

d. are built like arteries.

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Lymphatic capillaries owe their permeability to the presence of: a. an open end that siphons fluid from the interstitial fluid. b. minivalves in their walls. c. tight junctions between adjacent cells. d. proteins in the lymph fluid.

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Why would removal of lymph vessels from the right axillary region cause edema in the right arm?

a. Excess blood plasma builds up in regions where there are no lymph vessels. b. Surgery always results in tissue swelling.

c. Blood is inefficiently circulated in areas where surgery has occurred. d. Both b and c are true.

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Which of the following represents a logical sequence of structures that contribute to the return of fluid into the blood via the lymphatic system? a. Blood capillaries, arteries, lymphatic vessels, subclavian vein b. Arteries, lymphatic vessels, blood capillaries, subclavian vein c. Arteries, blood capillaries, lymphatic vessels, subclavian vein d. Subclavian vein, arteries, blood capillaries, lymphatic vessels Copyright © 2010 Pearson Education, Inc.

Which of the following contribute(s) to the flow of lymph through lymphatic vessels? a. The pumping of the heart

b. The milking action of skeletal muscle contraction c. Pressure changes in the thorax that result from breathing d. Both b and c

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Which of the following would the body perceive as an antigen? a. Bacteria

b. Virus c. Mismatched red blood cell

d. All of the above

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An advantage to having reticular connective tissue present in lymph nodes would be that: a. the loose organization of reticular connective tissue provides niches for macrophages and lymphocytes. b. lymph filters through the nodes and is exposed to lymphocytes and macrophages. c. lymphocytes cycle to various areas of the body and back to lymph nodes. d. all of the above take place. Copyright © 2010 Pearson Education, Inc.

The highest density of lymph nodes can be found ________. a. in the arms and legs

b. in the brain c. at the locations where lymphatic collecting vessels converge d. in the intestines

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Lymph tends to stall inside lymph nodes. This is due to: a. small-diameter spaces within the medulla.

b. the large volume of lymph entering the node. c. fewer efferent lymphatic vessels than afferent lymphatic vessels. d. fewer afferent lymphatic vessels than efferent lymphatic vessels.

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_________ can enter lymph capillaries.

a. Bacteria

b. Large proteins c. Interstitial fluid

d. All of the above

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The ______ is the largest lymphoid organ.

a. lymph node

b. spleen c. thymus

d. tonsil

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Red pulp of the spleen is most concerned with _______, while white pulp is most concerned with _________. a. immunity; new red blood cell formation b. filtering lymph; T lymphocyte formation

c. blood filtering; immunity d. urine formation; blood filtering

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Which of the following lymphoid tissues removes defective red blood cells from the blood? a. Lymph node b. Thymus c. Spleen d. Peyer’s patches

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The thymus is important for:

a. T lymphocyte maturation.

b. removal of foreign antigens. c. B lymphocyte maturation.

d. secretion of hormones that promote B lymphocyte immunocompetence.

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Tonsils promote memory of pathogens by:

a. secreting antibodies into the blood.

b. trapping food particles to support bacterial growth. c. trapping pathogens to develop immune cells with memory. d. producing B lymphocytes.

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