Lucy learns that the lymphatic system is part of the circulatory system. She wants to learn more about it and reads more carefully about the part it plays in circulation. What is the role of lymph nodes in the lymphatic system? A. They are found in the plasma and help fight off bacteria and other harmful microorganisms.
B. They filter plasma and return it back to the bloodstream.
C. They filter lymph by trapping harmful bacteria and other microorganisms in the fluid.
D. They transport lymph to where it is needed in the body.