Sites where lymphocytes interact with the antigens and then proliferate to become effector cells are called as secondary lymphoid organs.
Functions of lymph nodes:
1. Main function of lymph node is to clear the lymph (it is a clear liquid which comes from plasma) which carries pathogens and other foreign substances (like cancer cells) that are brought by the lymph, through lymphatic cells.
2. It is also responsible for providing immunity as it is the place were B and T lymphocytes interact.
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