lymhatic Flashcards
what cells directly attack and kill other cells?
cytotoxic T cells
what cells repond to antigens and activate various defense mechanisms, but do not carry out the attack themselves
Helper T cells
what cells play and inhibitory role to prevent the immune system from running out of control
regulatory T cells
what cells provide long-lasting memory of an antigen, and upon re-exposure, the immune system neutralizes the antigen so quickly that it causes no disease sympyoms
Memory T cells
what cells are found in bone marrow, are plasma cells tht secrete antibodies, and are memory B cells?
B lymphocytes (B cells)
what are cells that develop from monocytes, process foreign matter and transport antigenically active fragments of it, and dislay antigens to T cells?
macrophages
what are branched macrophages found in epidermis, mucous membranes, and lymphatic organs, and engulf foreign matter by receptor-mediated endocytosis (otherwise function like macrophages)
dendritic cells
what cells are stationary and found in the stroma of lymphatic organs?
reticular cells
what are lymphatic tissues made of?
collections of lymphocytes in connective tissue and mucous membranes
what are primary lymphatic organs
places where lymphocytes become immunocompetent. are red bone marrow and thymus
what are secondary lymphatic organs?
organs where lymphocytes already immunocompetent. include lymph nodes, tonsils, spleen
define immunocompetent
able to recognize and respond to antigens
what is the site of hemopoiesis
red bone marrow
how much of the skeleton does the red bone marrow occupy in children
medullary space of entire skeleton
what of the skeleton does red bone marrow occupy in adults?
axillary skeleton and proximal heads of humerous and femur
what is the bilibed organ between the sternum and aortic arch
thymus
what organ houses developing lymphocytes and secretes hormones
thymus
what organ is necessary for development of immunity in newborns?
thymus
what are numerous, bean-shaped structures less than 3 cm long?
lymph nodes
what function to cleanse lymph and act as a site of T and B cell activation
lymph nodes
in what regions are lymph nodes concentrated?
cervical, axillary, thoracic, abdominal, intestinal and mesenteric, inguinal, popliteal
what are patches of lymphatic tissue located at the entrance to the pharynx, where they guard against ingested and inhaled pathogens
tonsils
which of the tonsils are largest and most often infected?
palatine tonsils
what is the largest lymphatic organ?
spleen
