level: 5.4 B Lymphocytes and humoral immunity
Questions and Answers List
level questions: 5.4 B Lymphocytes and humoral immunity
| Question | Answer |
|---|---|
| Humoral Immunity | - Immunity involving B cells and antibodies |
| Antigenic Variability | - Viruses have many different strains with different antigens - Different antigens are formed due to changes in the genes of pathogen |
| B lymphocytes in humoral immunity | - B cells make 1 type of antibody so only binds to 1 antigen - Acts as macrophage, engulfs pathogen - B cells processes antigen, presents antigen on its cell-surface membrane - Helper T cells attach to processed antigen, releases cytokines stimulates.. - B cells to divide repeatedly by mitosis (clonal expansion) and differentiate into two cells |
| Two types of cells produced in clonal expansion | - Plasma cells - Memory cells |
| Plasma cells | - Primary Immunity: Plasma cells produce antibodies that inhibit the pathogen |
| Memory cells | - Secondary Immunity: Memory cells produce antibodies that inhibit the pathogen upon second infection |