CHAPTER 1 – ADAPTIVE IMMUNITY (FROM THE TEXT)
1. Adaptive immunity is the form of immunity that is stimulated by microbes, has a fine
specificity for foreign substances and responds more effectively against each successive
exposure to a microbe.
2. Lymphocytes (B cells and T cells) are the cells of adaptive immunity and are the only
cells with clonally distributed receptors for antigens.
3. Adaptive immunity consists of humoral immunity, in which antibodies neutralize and
eradicate extracellular microbes and toxins, and cell-mediated immunity, in which T cells
eradicate intracellular microbes.
4. Adaptive immune responses consist of sequential phases: antigen recognition by
lymphocytes, activation of the lymphocytes to proliferate and to differentiate into effector
and memory cells, elimination of the microbes, decline of the immune response and
5. B lymphocytes are the only cells that produce antibodies. B lymphocytes express
membrane antibodies that rec