D313 Lymphatic System Key Terms with
Complete Solutions 2025
hematopoiesis - ANSWER production of blood cells and platelets, which occurs in the
red marrow of the bones
red bone marrow - ANSWER that part of the bone marrow that contains blood stem
cells that can turn into red blood cells, white blood cells, or platelets
thymus - ANSWER organ that is involved in the development and maturation of T cells
lymphocytes - ANSWER agranular leukocytes of the lymphoid stem cell line, many of
which function in specific immunity; includes B cells, T cells, and natural killer cells
naïve lymphocyte - ANSWER mature B or T cell that has not yet encountered its antigen
for the first time
germinal centers - ANSWER clusters of rapidly proliferating B cells found in secondary
lymphoid tissues
high endothelial venules - ANSWER vessels containing unique endothelial cells
specialized to allow migration of lymphocytes from the blood to the lymph node
afferent lymphatic vessels - ANSWER the vessels that enter the lymph nodes and
contain valves to prevent backflow of lymph
efferent lymphatic vessel - ANSWER the vessels that leave the lymph node at the hilum
and contain valves that prevent lymph from flowing in the wrong direction
, spleen - ANSWER secondary lymphoid organ that filters pathogens from the blood
(white pulp) and removes degenerating or damaged blood cells (red pulp)
lymphoid nodules - ANSWER unencapsulated patches of lymphoid tissue found
throughout the body
tonsils - ANSWER lymphoid nodules associated with the nasopharynx
mucosa-associated lymphoid tissue (MALT) - ANSWER lymphoid follicles associated with
the mucosa
gut-associated lymphoid tissue (GALT) - ANSWER a constitutive mucosal lymphoid tissue
in the gastrointestinal tract
bronchus-associated lymphoid tissue (BALT) - ANSWER a constitutive mucosal lymphoid
tissue lying adjacent to major airways
lymphatic capillaries - ANSWER smallest of the lymphatic vessels and the origin of lymph
flow
chyle - ANSWER a milky fluid having fat droplets that drains from the small intestine
lacteals into the lymphatic system
lymphatic trunks - ANSWER large lymph vessels that are formed when many efferent
lymph vessels meet
cisterna chyli - ANSWER bag-like vessel that forms the beginning of the thoracic duct
Complete Solutions 2025
hematopoiesis - ANSWER production of blood cells and platelets, which occurs in the
red marrow of the bones
red bone marrow - ANSWER that part of the bone marrow that contains blood stem
cells that can turn into red blood cells, white blood cells, or platelets
thymus - ANSWER organ that is involved in the development and maturation of T cells
lymphocytes - ANSWER agranular leukocytes of the lymphoid stem cell line, many of
which function in specific immunity; includes B cells, T cells, and natural killer cells
naïve lymphocyte - ANSWER mature B or T cell that has not yet encountered its antigen
for the first time
germinal centers - ANSWER clusters of rapidly proliferating B cells found in secondary
lymphoid tissues
high endothelial venules - ANSWER vessels containing unique endothelial cells
specialized to allow migration of lymphocytes from the blood to the lymph node
afferent lymphatic vessels - ANSWER the vessels that enter the lymph nodes and
contain valves to prevent backflow of lymph
efferent lymphatic vessel - ANSWER the vessels that leave the lymph node at the hilum
and contain valves that prevent lymph from flowing in the wrong direction
, spleen - ANSWER secondary lymphoid organ that filters pathogens from the blood
(white pulp) and removes degenerating or damaged blood cells (red pulp)
lymphoid nodules - ANSWER unencapsulated patches of lymphoid tissue found
throughout the body
tonsils - ANSWER lymphoid nodules associated with the nasopharynx
mucosa-associated lymphoid tissue (MALT) - ANSWER lymphoid follicles associated with
the mucosa
gut-associated lymphoid tissue (GALT) - ANSWER a constitutive mucosal lymphoid tissue
in the gastrointestinal tract
bronchus-associated lymphoid tissue (BALT) - ANSWER a constitutive mucosal lymphoid
tissue lying adjacent to major airways
lymphatic capillaries - ANSWER smallest of the lymphatic vessels and the origin of lymph
flow
chyle - ANSWER a milky fluid having fat droplets that drains from the small intestine
lacteals into the lymphatic system
lymphatic trunks - ANSWER large lymph vessels that are formed when many efferent
lymph vessels meet
cisterna chyli - ANSWER bag-like vessel that forms the beginning of the thoracic duct
