What is the main role of the lymphatic system?

The lymphatic system plays a crucial role in fluid management in the body. It is responsible for collecting excess interstitial fluid, which is the fluid that exists between cells, and returning it to the bloodstream. This process helps to maintain fluid balance and prevents tissue swelling, also known as edema. The lymphatic system consists of a network of vessels, lymph nodes, and organs that collaborate to transport lymph, a fluid containing white blood cells, and to facilitate immune responses.

By regularly draining excess fluids and filtering them through lymph nodes, the lymphatic system not only aids in fluid homeostasis but also serves as an essential component of the immune system by transporting pathogens and other foreign substances to immune cells for detection and removal. Thus, its primary function aligns clearly with fluid management, making this the accurate choice among the options provided.