The lymphatic system supports which functions?

• A. Oxygen transport
• B. Immune function and fluid balance
• C. Hormone production
• D. Blood sugar regulation

Answer: (B)

The lymphatic system mainly handles immune defense and tissue fluid balance. It drains excess fluid from tissues and returns it to the bloodstream, helping maintain proper blood volume and prevent edema. Lymph nodes and other lymphoid tissues host immune cells, filtering lymph as it passes through, trapping pathogens, and coordinating the production and activation of lymphocytes that drive immune responses. While some lymphatic components also absorb dietary fats (via lacteals in the intestine), the core functions in this context are maintaining fluid balance and supporting immunity. Oxygen transport is the job of the circulatory system, hormones are produced by the endocrine system, and glucose regulation is controlled by metabolic/endocrine processes.