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Chapter 20

The Lymphatic System

3 basic components of lymphatic system lymph vessels, lymph nodes & lymph
what carries fluid back into the tissues? lymph vessels
lymph is the ___ interstital fluid being collected
what are the filtering checkpoints to make sure everything is okay? lymph nodes
the lymphatic vessels form a 1-way system which lymph only flows ___ towards the heart
this duct drains lymph from right arm and side of body? right lymphatic duct
a special set of lymphatic capillaries that transports fat from the small intestine to the bloodstream is known as.... lacteals
the thoracic duct is responsible for ___
lymphocytes protect the body against __ antigens
macrophages eat foreign substances - activate T cells
this type of cell capture antigens and bring them to the lymph nodes? dendritic cells
which cell produce a network of lymphoid tissues? reticular cells
the lymphatic system functions in returning fluids ___ that have leaked from the tissues back to the blood
what is absent in bone, teeth, bone marow & entire CNS? lymphatic capillaries
__ cells initiate immune response dendritic
lymph enters lymph nodes via __ vessels and exit via __ vessels afferent- efferent
why are there fewer efferent vessels? allows time for cleansing
blood cell production occurs in the __ which is the maturation of __ cells bone marrow - B
lymph nodes functions in ___ and ___ cleansing the lymph - immune system activation
maturation sites are the ___ lymphoid organs primary
the secondary lymphoid are exposed to antigens. these include __, __ and ___ MALT - spleen - thymus
this lymphoid organ is the site for proliferation & immune surveillance and response. spleen
this organ is responsible for cleaning the blood, recycling RBC's, stores platelets & monocytes. spleen
what lymphoid organ is most active in early childhood? thymus
maturation for T cells. thymus
______ is so permeable that they were thought to be open at one end like a straw. lymphatic capillaries
why are lymphatic capillaries so permeable? endothelial cells forming the walls of lymphatic capillaries are not tightly joined
when fluid pressure in the interstitial space is greater than pressure in the lymphatic capillary, what happens? minvalves open allowing fluid to enter capillary
when fluid pressure is greater inside the lymphatic capillary, the minivalves.... are forced shut - preventing lymph from leaking back in
the daughter cells of B cells are known as__ plasma cells
what type of lymphoid tissue is found in almost every organ in the body? diffuse lymphoid tissue
the ___ cells circulate continuously between the blood, lymph nodes, and lymph performing their surveillance role. T
all lymphoid organs are composed of reticular connective tissue except for the__ thymus
the lymphatic vessels help maintain ___ blood volume
if the spleen must be removed, what 2 organs take over most of its functions? bone marrow & liver
what is the only organ that doesn't directly fight antigens? thymus
the thymus has no follicles because... it lacks B cells
muscoa-associated lymphoid tissues (MALT) are... lymphoid tissues located in mucous membranes
___ helps protect us from pathogens that seek to enter our body MALT
what gathers and remove many of the pathogens entering the pharynx in food or inhaled air? tonsils
large clusters of lymphoid particles are called: peyer patches
the appendix is responsible for destroying bacteria and ___ making "memory" lymphocytes for long term immunity
each lymph node contains a fibrous capsule, __ and ___ cortex - medulla
in the lymph node..the cortex __ act on immune responses
what does the medulla of the lymph node do? contains macrophages - eat debris
Created by: Mariahj25



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