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11 Cards in this Set
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- Back
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T/F Thymus is most active in adulthood
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FALSE. thymus is most active in childhood!
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what hormones do thymus produce?
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the thymus secretes the hormones, thymopoietin & thymosin.
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what makes the thymus a special lymphoid organ? hint: main purpose
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the thymus is special in that it functions strictly in T lymphocyte maturation
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what are the functions of the lymph nodes?
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lymph node functions:
-lymph enters through afferent lymphatic vessels & percolates through lymph sinuses -most antigenic challenges occur in lymph nodes -antigens activate B & T lymphocytes -antigens are then destroyed -sinuses in nodes contain macrophages |
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what is the largest lymphoid organ?
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spleen is largest lymphoid organ
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what are the primary lymphoid organs?
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primary lymphoid organs = red bone marrow & thymus
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purposes of spleen?
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spleen function:
-storage of platelets -site of hematopoiesis in the fetus -site of B cell maturation into plasma cells |
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what is the white pulp of the spleen?
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white pulp of spleen = destruction of antigens
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what is the red pulp of the spleen?
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red pulp of spleen=phagocytosis of bacteria & worn out RBCs, WBCs and platelets
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what are effector cells?
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EFFECTOR CELLS
lymphocytes that are short lived & respond to pathogen immediately and then die |
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what are memory cells?
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MEMORY CELLS
lymphocytes are long lived & are basis of acquired immunity; wait w/in lymphoid tissues until antigen is encounvtered again & guards against infection |
