Blood
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B-<br />
lymphocytes<br />
• :Development<br />
• U.M.C in the bone marrow colony forming cells … lymphoblast . B… .lymphocyte . B<br />
• Percentage: 30% .lymphcytes<br />
• Types:<br />
• B.lymphocytes of humoral immunity.<br />
• B.memory cells.<br />
• :Life span .3months<br />
• Function<br />
• 1- Humoral immunity:<br />
• When exposed to antigen, they are activated into medium sized lymphocytes.<br />
• Some of the active cells are differentiated into plasma cells which produce<br />
antibodies.<br />
• This is called primary immune response.<br />
2- Secondary response (B memory cells):<br />
• Some of the active cells are not changed into plasma cells but remain as memory<br />
cells.<br />
• When exposed to the same antigen again, they produce more rapid and more<br />
extensive humoral immune response.<br />
Dr. Amal M. Moustafa, , Department of Histology & Cytology
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