What are the components of the lymphatic system and what do they do?

A primary function of lymphatic vessels is:   a. the circulation of white blood cells b. act as a shock absorber for the brain c. transport extracellular fluid for filtration  d. to regulate fluid through the digestive tract e. the return of blood from the capillaries to the heart

The germinal centers in lymph nodes are sites of (a) the lymph sinuses, (b) proliferating B lymphocytes, (c) T lymphocytes, (d) a and c, (e) all of the above.

Which lymphatic structures filter lymph? Which filters blood?

What is the significance of lymphatic fluid traveling through various regions of the lymph node?