Anathomy, Lymphatic System

Compose 400 words or more discussion to respond the following:

What is meant by the term venous return? What is the overall function of the Lymphatic System? Compare lymphatic vessels with blood vessels. Where are lymph nodes usually found? What functions are carried out by lymph nodes? Where are the tonsils located? What major role does the thymus play in Immunity? What are the major functions of the spleen?