Ch 4: Lymphatic System

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What structural feature of lymphatic vessels is responsible to forward movement of lymph?

a) over-lapping endothelial cells
b) valves
c) no basement membrane
d) thin walls
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Terms in this set (20)
Mucosal associated lymphatic tissues (MALT) are

a) aggregates of macrophages located in the intestines

b) clusters of splenocytes located in the lamina propria of mucous membranes

c) clumps of mucous lining the lumen of the gastrointestinal tract

d) aggregates of lymphatic tissue scattered throughout the lamina propria of mucous membranes
How do lymphatic capillaries differ from blood capillaries?

a) lymphatic capillaries do not have a basement membrane

b) simple squamous epithelial cells of lymphatics overlap with loose attachments

c) lymphatic capillaries are more permeable than blood capillaries

d) lymphatic capillary epithelium act as one-way valves preventing movement of fluid back into interstitial spaces

e) all of the above
What is the purpose of lacteals? a) drain blood from the spleen b) absorb fluid from capillary beds c) absorb lipids from the digestive tract d) absorb solutes from interstitial spacesabsorb lipids from the digestive tractWhich of the following organs does NOT contain lymphatic tissue? a) liver b) spleen c) lingual tonsils d) thymus e) pharyngeal tonsilsliverWhat is the function of thymosin? a) destroys damaged red blood cells b) destroys damaged white blood cells c) activates lymphocytes in lymph nodes d) maturation of T-cellsmaturation of T-cellsBacteria and debris are actively removed from the lymph by _____ in the sinuses of lymph nodes. a) trabecular cells b) germinal cells c) macrophages d) lymphocytes e) plasma cellsmacrophagesGerminal centers are the sites of a) increased blood flow to the lymph nodes b) fluid production c) increased flow of lymph from infected tissues d) entrance of lymph into lymph nodes e) proliferation of lymphocytes in the lymph nodesproliferation of lymphocytes in the lymph nodesThe lymphatic system is involved in a) lipid absorption from the digestive tract b) transporting lymph from the intestines to the liver c) maintenance of pH in the tissues d) production of erythrocytes e) protein metabolismlipid absorption from the digestive tractThe lymphatic system plays a role in maintaining fluid balance within the body by a) adding lymph to GI tract secretions b) returning interstitial fluid to the plasma c) transporting lymph from tissues to the liver d) carrying excess fluid to the kidneys to be excreted e) actively absorbing fluid from the bloodreturning interstitial fluid to the plasmaWhich of the following is NOT a function of the lymphatic system? a) defending from infection by microorganisms and other foreing substances b) aiding in erythropoiesis of red blood cells c) maintaining fluid balance by returning excess interstitial fluid to the blood d) absorbing and transporting lipids from the digestive tractbThe lymphatic system differs from the cardiovascular system in that a) the lymphatic system only carries fluid away from tissues b) the lymphatic vessels have their own "pump" to assist flow c) lymph capillaries do not contain any fluid d) lymph capillaries allow free movement of fluid in and out of the capillaries e) lymph circulates fluids and cardiovascular does notaTonsils a) increase in size in adults b) are located in both the oral and abdominal cavities c) provide protection against bacteria entering the oral and nasal cavities d) contain red pulp and white pulp e) are not functional in childrenc