BIOC21H3 Lecture : LEC 9 -LYMPHATIC TISSUE

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Lecture 9: lymphatic tissue y neutrophils most numerous wbc in blood, but lymphocytes most abundant in lymphatic tissues/peripheral tissues y primary lymphatic organs where lymphocytes are. Lymphocytes come from bone marrow, either stay there (b lymph) or migrate into thymus, and started to develop and become educated, usually t lymphocytes. Bone marrow and thymus: want a cell that is capable of mounting an immune response. Want to educate them because capable of destruction, want them to know what to attack y 2ndary lymphatic organs educated but still naive lymphocytes are going to circ to, and meet the pathogen. These cells, at this point, can respond to a pathogen. Tonsils basically a large aggregation of lymphatic nodules, in oral cavity, and first point of contact with potential pathogen y organs have a capsule made of dense irreg connective tissue, Antigen presenting cell: not all apc are part of mps.