| Term 
 | Definition 
 
        | carry lymph (water and proteins) and lymphocytes from peripheral tissues to veins of the cardiovascular system |  | 
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        | Term 
 | Definition 
 
        | Monitor the composition of lymph; contain cells that engulf pathogens and stimulate immune response |  | 
        |  | 
        
        | Term 
 | Definition 
 
        | Monitors circulating blood; contains cells that engulf pathogens and stimulate immune response |  | 
        |  | 
        
        | Term 
 | Definition 
 
        | Controls development and maintenance of one class of lymphocytes (t-cells) |  | 
        |  | 
        
        | Term 
 | Definition 
 
        | Defends against infection and disease, returns tissue fluid to the bloodstream |  | 
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