The lymphatic system has many functions in the human body. Here are the two main ones.
1.) the fat tissue in the body is transported through lymph tissue, part of the lymphatic system.
2.)the lymphatic system also has a significant role in the human defense system. After a pathogen (a disease causing substance eg. Bacteria) has bypassed the general defence system, its up to the lymphatic system to fight these infections.
It does this through the production of antibodies against these pathogens. Cells are produced to produce and antibodies, namely, b and t cells. Examples of these cells include; killer t cells(what it says on the tin.) memory b AND t cells memorise the pathogen so it does not infect you again(induced immunity). Suppressor t cells stop killer cells from destroying normal healthy human cells. These particular cells have a significant role immunity.
Not 100% sure but I think the lymphatic system has a role in the production of phagocytes and monocytes which engulf the bacteria(as opposed to using chemicals to destroy them). Ps. Antibodies recognise pathogens through specific antigens on these harmful cells.
Finally, I believe the lymphatic system can be linked with white blood cells in the production of additional immunity proteins but you may have to do your own research on that!
