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A(n) _________ is a small, soluble protein secreted by immune cells and acts as a chemical messenger to regulate the immune system. 

True or False: Lymphocytes mature in the primary lymphoid organs. 

Classify the following as either primary or secondary lymphoid organs: 

Upon encountering a pathogen, the movement of lymph throughout the lymph nodes is halted. This results in the swelling of the lymph nodes and is termed: 

A _________ is either a foreign substance that induces a host response or self surface structures that are seen as foreign to others when introduced. 

In which condition would you expect an increase in eosinophils to be present? 

B Cells mature in the: 

HIV – India

Which of the following are produced by plasma cells specifically in response to a particular antigen: 

Unstimulated (naïve) B Cells are found within the _________ of the spleen, where they await activation by T cells once the T Cells have encountered a pathogen.