Explain the structure and function of the lymph nodes. explain why they may become swollen.

The primary function of all lymph nodes is the production of lymphocytes, which help defend the body against microorganisms and against harmful foreign particles and debris from lymph before it is returned to the blood stream. The major clusters of lymph nodes are in six areas.

Mar 11, 2016 - The primary function of the lymphatic system is to transport lymph, a fluid ... They are located deep inside the body, such as around the lungs and heart, ... swelling and pain due to lymphedema in the arm, Hamrick explained. ... This may be discovered when the lymph nodes become enlarged enough to be ...