A&P II chapter 20 (lymphoid organs and tissues)

Which statement correctly describes the origin of lymph fluid? a.) Lymph is fluid collected from arteriovenous anastomoses. b.) Lymph is secreted into the lymph vessels. c.) Lymph is excess tissue fluid formed from plasma that has leaked from capillaries d.) Lymph is collected from fluid that accumulates in veins as blood slowly circulates back toward the heart.

Lymph is excess tissue fluid formed from plasma that has leaked from capillaries

What is the main function of the lymphatic system? a.) The lymphatic system returns leaked fluid and plasma proteins that escape from the bloodstream to the blood. b.) The lymphatic system produces high fluid pressures to assist in lymph motion. c.) The lymphatic system transports blood and lymph throughout the body. d.) The lymphatic system makes blood cells through a process known as hematopoiesis.

The lymphatic system returns leaked fluid and plasma proteins that escape from the bloodstream to the blood.

Which of the following statements is true regarding veins versus lymphatic collecting vessels? a.) Veins tend to form more branches (anastamoses) than lymphatic vessels. b.) Veins have thinner walls than lymphatic vessels. c.) Veins and lymphatic vessels have a different number of tunics. d.) Veins have fewer internal valves than lymphatic vessels.

Veins have fewer internal valves than lymphatic vessels.

Lymphatic capillaries are NOT found in __________. a.) Skeletal muscles b.) the heart c.) the small intestine d.) bone marrow

bone barrow

Which of the following lymphoid cells trap antigens and transport them to lymph nodes? a.) macrophages b.) dendritic cells c.) T lymphocytes d.) plasma cells

dendritic cells

Like blood, lymph flows both to and from the heart. a.) True b.) False

false

The most important role of the spleen is to provide a site for lymphocyte proliferation and immune surveillance and response. a.) True b.) False

false

The thymus functions strictly in maturation of B cells. a.) True b.) False

false. the role of the thymus is to foster T cell maturation

Which of the following promotes closure of the minivalves associated with lymph capillaries? a.) increasing pressure inside the lymph capillary b.) inflammation of tissues surrounding lymphatic capillaries c.) anchoring of endothelial cells to adjacent structures by collagen fibers d.) increasing pressure in the interstitial space

increasing pressure inside the lymph capillary

The __________ tonsil(s) is/are referred to as the adenoids if enlarged. a.) tubal b.) pharyngeal c.) palatine d.) lingual

pharyngeal

Which lymphoid cells produce antibodies? a.) dendritic cells b.) plasma cells c.) macrophages d.) reticular cells

plasma cells

Which of the following is NOT a function of the spleen? a.) store iron from hemoglobin b.) remove and recycle old erythrocytes and platelets c.) produce new erythrocytes in adults d.) house B and T lymphocytes

produce new erythrocytes in adults

The spleen is a unique lymphoid organ that filters blood, rather than lymph. Following splenectomy (surgical removal of the spleen) in an adult, which of the following splenic functions would be performed by the bone marrow or liver? a.) immune surveillance b.) erythropoiesis c.) removal of aged and damaged red blood cells from the blood d.) plasma protein production

removal of aged and damaged red blood cells from the blood

Which of the following mechanisms is NOT used to propel lymph through lymphatic vessels? a.) small, heart-like pumps b.) gravity c.) pulmonary motion d.) the milking action of muscles

small, heart-like pumps

Which of the following is a role of lymph nodes? a.) They produce red blood cells. b.) They filter lymph. c.) They return lymph to circulation. d.) They produce lymph.

they filter lymph

Which of the following vessels delivers lymph into the junction of the internal jugular vein and the subclavian vein? a.) cisterna chyli b.) thoracic duct c.) subclavian trunk d.) jugular trunk

thoracic duct

Which lymphoid organ(s) appear(s) before the others? a.) lymph nodes b.) thymus c.) appendix d.) tonsils

thymus

Which of the following lymphoid tissues/organs do(es) NOT contain reticular connective tissue? a.) spleen b.) thymus c.) tonsils d.) lymph nodes

thymus

Which lymphoid organ(s) serve(s) as the site where T lymphocytes become immunocompetent T cells? a.) thyroid gland b.) tonsils c.) red bone marrow d.) thymus gland

thymus gland

Which of the following is NOT a function of the lymphatic system? a.) to return excess interstitial fluid to the bloodstream b.) to transport absorbed lipids from the small intestine to the bloodstream c.) to carry pathogens towards lymph nodes d.) to participate in gas exchange at capillaries

to participate in gas exchange at capillaries

About 3 liters of fluid are lost to the tissue spaces every 24 hours and are returned to the bloodstream as lymph. a.) True b.) False

true

Lymph arrives at the lymph nodes via afferent lymphatic vessels. a.) True b.) False

true

Lymphatic ________ are formed from the union of the largest collecting lymphatic vessels. a.) ducts b.) capillaries c.) nodes d.) trunks

trunks

Once collected, lymph is ultimately transported into __________. a.) lymph nodes b.) the liver for detoxification c.) venous circulation d.) arterial circulation

venous circulation

Peyer's patches are mucosa-associated lymphoid tissue located in the __________. a.) wall of the small intestine b.) wall of the colon c.) spleen d.) liver

wall of the small intestine