Lymphatic System

Which of the following statements accurately describes the thymus gland? Select one: a. The thymus gland lacks a capsule. b. The thymus gland contains many reticular fibers. c. The thymus gland decreases in size after age 60. d. Lymphocytes are found only in the medulla of the thymus gland. e. The thymus increases in size with aging.

The thymus gland decreases in size after age 60.

Describe the wall of lymphatic capillaries. Select one: a. Thin-walled, with tightly joined squamous cells b. Thin-walled, with tightly joined cuboidal cells c. Thick-walled, with overlapping squamous cells d. Thick-walled, with tightly joined squamous cells e. Thin-walled, with overlapping squamous cells Feedback

Thin-walled, with overlapping squamous cells

Lymph movement is assisted by Select one: a. contraction of skeletal muscle. b. contraction of smooth muscle in lymph vessel. c. pressure changes in the thorax during respiration. d. compression of lymphatic vessels. e. All of these choices are correct.

a. contraction of skeletal muscle. b. contraction of smooth muscle in lymph vessel. c. pressure changes in the thorax during respiration. d. compression of lymphatic vessels. e. All of these choices are correct.

The white pulp of the spleen Select one: a. contains lymphocytes that can stimulate an immune response. b. filters lymph as it flows through the spleen. c. destroys defective red blood cells. d. stimulates immune responses, filter lymph, and destroys defective red blood cells.

contains lymphocytes that can stimulate an immune response.

The lymphatic system is involved in Select one: 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 metabolism.

lipid absorption from the digestive tract

Which of the following organs does NOT contain lymphatic tissue? Select one: a. liver b. spleen c. lingual tonsils d. thymus e. pharyngeal tonsils.

liver

Lymph nodules are Select one: a. small, bean-shaped structures. b. the site of erythrocyte production. c. located in the loose connective tissue of the digestive system. d. composed of an outer cortex and inner medulla. e. connected together in a series.

located in the loose connective tissue of the digestive system.

Bean-shaped lymphatic organs found along lymphatic vessels are called Select one: a. lymph nodes b. medullary cords. c. cisterna chyli. d. trabeculae. e. lymph nodules.

lymph nodes

Lacteals are Select one: a. a type of lymphocyte. b. a nonspecific defense. c. lymphatic vessels in the lining of the small intestine. d. the sinuses inside a lymph node. e. germinal centers.

lymphatic vessels in the lining of the small intestine.

Bacteria and debris are actively removed from the lymph by _____ in the sinuses of lymph nodes. Select one: a. trabecular cells b. germinal cells c. macrophages. d. lymphocytes e. plasma cells

macrophages.

What is the function of thymosin? Select one: a. destroys damaged red blood cells b. destroys damaged white blood cells c. activates lymphocytes in lymph nodes d. maturation of T-cells

maturation of T-cells

Adenoids are enlarged Select one: a. lingual tonsils. b. pharyngeal tonsils. c. palatine tonsils. d. cervical lymph nodes. e. axillary lymph nodes.

pharyngeal tonsils.

Germinal centers are the sites of Select one: 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 nodes.

proliferation of lymphocytes in the lymph nodes.

Tonsils Select one: 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 children.

provide protection against bacteria entering the oral and nasal cavities.

All of the following are components of lymph, except Select one: a. water. b. ions. c. nutrients. d. hormones. e. red blood cells.

red blood cells

The lymphatic system plays a role in maintaining fluid balance within the body by Select one: 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 blood.

returning interstitial fluid to the plasma

Peyer patches are lymphatic nodules found in the Select one: a. lymph nodes. b. spleen and tonsils. c. appendix and tonsils. d. small intestine and appendix.

small intestine and appendix.

The lymphatic system differs from the cardiovascular system in that Select one: 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 not.

the lymphatic system only carries fluid away from tissues.

Lymphatic tissue contains an interlaced network of reticular fibers that functions to Select one: a. produce lymphocytes. b. produce capsules around lymph nodes. c. attack microorganisms. d. line the walls of lymphatic vessels. e. trap microorganisms.

trap microorganisms.

What structural feature of lymphatic vessels is responsible to forward movement of lymph? Select one: a. over-lapping endothelial cells b. valves c. no basement membrane d. thin walls

valves