A major function of the lymphatic system is:
Return tissue fluid to the cardiovascular system. A major function of the lymphatic system is return of tissue fluid to the cardiovascular system. Approximately three liters of fluid are picked up each day.
Collections of lymphoid tissue (MALT) that guard mucosal surfaces include all the following, except:
The thymus. The thymus is the site of T cell maturation.
In addition to its lymphoid function, this organ holds a reservoir of platelets.
Spleen. The spleen holds a reservoir of platelets; it also removes old and damaged red blood cells.
The structural framework of lymphoid tissue is offered by:
Reticular connective tissue. This tissue dominates in all lymphoid organs, except the thymus.
This structure, attached to the cecum, is in an ideal location to destroy bacteria before it migrates into the large intestine.
Appendix. This appendix extends from the cecum.
What lymphatic structure absorbs excess tissue fluid?
Capillary. The capillaries absorb excess tissue fluid. They have pressure-sensitive valves.
What lymphatic structure absorbs lipids in the intestine?
Lacteal. Lacteals are located in the intestinal villi.
What lymphatic structures trap bacteria in the posterior oral mucosa?
Palatine tonsils. These palatine tonsils are most often infected.
Which of the following are located in the spleen's white pulp?
Lymphocytes. Lymphocytes are located in white pulp.
Which sequence best describes the flow of lymph through the lymphatic system?
Capillaries, vessels, trunks, and ducts. Capillaries pick up lymph and ducts return it to the cardiovascular system.
Which statement below describes the lymphatic system's role in relation to the cardiovascular system?
? It maintains blood volume and, hence, pressure. As much as three liters of lymph must be returned to the blood volume each day.
Which statement is true of the thoracic duct?
? It drains the lymph from the entire left side of the body and the right abdomen and leg. The thoracic duct drains its lymph at the junction of the left internal jugular and subclavian veins.
Which statement is true about lymph nodes?
They have fewer efferent vessels than afferent (incoming) vessels. They have fewer efferent vessels than afferent (incoming) vessels. This slows the flow of the lymph through the node.
Which of the following best describes the arrangement of lymphatic vessels?
A one-way system of vessels beginning with blind-ended lymphatic capillaries. The lymphatic vessels form a one-way system in which lymph flows only toward the heart. It begins as blind-ended capillaries.
Which of the following is the major lymphoid organ that "trains" T lymphocytes to become immunocompetent?
Thymus. T cells develop in the Thymus.
Which of the following are the principle lymphoid organs in the body?
Lymph nodes. The principle lymphoid organs in the body are the lymph nodes, which cluster along the lymphatic vessels of the body.
The lymphoid organs located in the throat that defend against invading bacteria coming in through the mouth and nose are:
Tonsils. The tonsils form a ring of lymphatic tissue around the entrance to the pharynx.
Which of the following statements about the spleen is FALSE?
It is best to perform a splenectomy if the spleen is damaged in a car accident.
Which of the following vessels transport fluid that leaks from the vascular system back into the blood?
Lymphatics. Sinusoids do not transport fluid that leaks from the vascular system back into the blood.
Excess tissue fluid in the brain drains into the:
CSF. Excess tissue fluid in the brain drains into the CSF.
Which of the following features is NOT common to both lymphatic collecting ducts and veins?
Chyle. Both lymphatic collecting ducts and veins have walls made of three layers.
When B lymphocytes are dividing rapidly, the _____ of the lymphoid tissue enlarges.
Germinal centers. When B lymphocytes are dividing rapidly, the germinal centers of the lymphoid tissue enlarges.
Where are plasma cells found in the node?
In the medullary cords. Plasma cells are found in the medullary cords of the lymph node.
Large lymph capillaries spanned by crisscrossing reticular fibers are known as:
Lymph sinuses. Medullary cords are thin, inward extensions from the cortical lymph tissue in the lymph node.
Which of the following cells would not be found in a germinal center in a lymph node?
Monocytes. Follicular dendrite cells are found in the germinal center of a lymph node.
Where is the site of erythrocyte production in the fetus?
The site of erythrocyte production in the fetus is the spleen.
Areas of lymphocytes suspended by reticular fibers in the spleen are known as:
White pulp. There are no medullary cords in the spleen.
A sentinel node is the first lymph node:
That receives lymph drainage from a body area suspected of cancer. A sentinel node is the first lymph node that receives lymph drainage from a body area suspected of cancer.
What part of the lymphatic system is most closely associated with capillary beds?
Lymphatic collecting vessels.
How are lymphatic collecting vessels different from veins?
Lymphatic collecting vessels have endothelial flaps valves, but veins do not.
Statement on back of card.
Activated B cells, called plasma cells, are responsible for producing antibodies. Macrophages are phagocytic cells that help to defend the body. Dendritic cells are especially efficient at capturing antigens and presenting them to lymph nodes. Reticular cells are fibroblast-like cells that produce the reticular fiber stroma.
Reticular connective tissue is found in all lymphoid organs and tissues.
False. The thymus is the single lymphoid organ that does not contain reticular connective tissue.
Which of the following lists the correct order of lymph flow through the lymph node?
? Afferent vessel, subcapsular sinus, medulla, efferent vessel.
Choose the true statement about the thymus. After puberty, the thymus begins to decrease in size.
Which of the following is not a part of the mucosa-associated lymphatic tissue (MALT)?
The spleen. The mucosa-associated lymphatic tissue (MALT) includes the Peyer's patches, tonsils, appendix, and the lymphoid follicles of the respiratory and genitourinary tracts. The spleen is not a MALT tissue.
Except for the _____ and the spleen, the lymphoid organs are poorly developed at birth.
Tonsils. Only the tonsils and the spleen are well developed by birth. Shortly after birth the other lymphoid tissues and organs become populated by lymphocytes, and their development parallels the maturation of the immune system.