Which term maintains fluid balance and immune function in the body?

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The lymphatic system keeps tissue fluid balanced by returning excess fluid to the bloodstream and supports immune defense by transporting immune cells and filtered material through lymph nodes. Lymph capillaries are the entry points that absorb interstitial fluid, while lymph is the fluid itself. Lymphatic drainage describes the process in general, not a specific pathway. Efferent lymph vessels are the vessels that carry lymph away from lymph nodes after filtration, allowing continuous flow back toward the venous system. This flow is essential for both returning fluid to circulation and delivering immune components for surveillance, which is why efferent lymph vessels best fit the idea of maintaining fluid balance and immune function.