Definition of transient ischemic attack. : a brief episode of cerebral ischemia that is usually characterized by temporary blurring of vision, slurring of speech, numbness, paralysis, or syncope and is often predictive of a serious stroke âabbreviation TIA âcalled also ministroke.
Germinal centers are an important part of the B cell humoral immune response, acting as central factories for the generation of affinity matured B cells specialized in producing improved antibodies that effectively recognize infectious agents, and for the production of durable memory B cells.nce these B cells have stopped proliferating, they migrate to the light zone where they are known as centrocytes, and are subjected to selection by follicular helper T (TFH) cells in the presence of follicular dendritic cells (FDCs).
the primary function of all lymph nodes is the production of lymphocytes which help defend the body against microorganisms and against harmful foreign particles and debris from lymph before it is returned to the blood stream the major clusters of lymph nodes are in six areas those areas are 1he primary function of all lymph nodes is the production of lymphocytes which help defend the body against microorganisms and against harmful foreign particles and debris from lymph before it is returned to the blood stream the major clusters of lymph nodes are in six areas those areas are 1